diff --git a/coolName/pom.xml b/coolName/pom.xml
new file mode 100644
index 0000000..507d66a
--- /dev/null
+++ b/coolName/pom.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>programming-lab-example</artifactId>
+        <groupId>ru.spbstu.insys</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>coolName</artifactId>
+
+    <properties>
+        <maven.compiler.source>16</maven.compiler.source>
+        <maven.compiler.target>16</maven.compiler.target>
+    </properties>
+
+</project>
\ No newline at end of file
diff --git a/coolName/src/main/java/GroupOfStudents.java b/coolName/src/main/java/GroupOfStudents.java
new file mode 100644
index 0000000..a880dcc
--- /dev/null
+++ b/coolName/src/main/java/GroupOfStudents.java
@@ -0,0 +1,87 @@
+import java.util.*;
+
+
+public class GroupOfStudents {
+    private final Map<String, HashMap> rating = new HashMap<>();
+
+    public int size() {
+        return rating.size();
+    }
+
+    void addStudent (String student, String subjects) {
+        if (student.isBlank() || rating.containsKey(student))
+            throw new IllegalArgumentException();
+        else {
+            Map<String, String> allSubjects = new HashMap<>();
+            String[] items = subjects.split(", ");
+            for(String item: items) {
+                if (item.split(" ").length < 2)
+                    allSubjects.put(item.split(" ")[0], " ");
+                else
+                    allSubjects.put(item.split(" ")[0], item.split(" ")[1]);
+            }
+            rating.put(student, (HashMap) allSubjects);
+        }
+    }
+
+    void deleteStudent (String student) {
+        if (student.isBlank() || !rating.containsKey(student))
+            throw new IllegalArgumentException();
+        rating.remove(student);
+    }
+
+    void changeMark (String student, String subject, int mark) {
+        if (student.isBlank() || subject.isBlank() || mark <= 0 || !rating.containsKey(student))
+            throw new IllegalArgumentException();
+        Map<String, String> items = rating.get(student);
+        items.put(subject, Integer.toString(mark));
+        rating.put(student, (HashMap) items);
+    }
+
+
+    void addMark (String student, String subject, int mark) {
+        if (student.isBlank() || subject.isBlank() || mark <= 0 || !rating.containsKey(student))
+            throw new IllegalArgumentException();
+        Map<String, String> items = rating.get(student);
+        items.put(subject, Integer.toString(mark));
+        rating.put(student, (HashMap) items);
+    }
+
+    void deleteMark (String student, String subject) {
+        if (student.isBlank() || subject.isBlank() || !rating.containsKey(student))
+            throw new IllegalArgumentException();
+        Map<String, String> items = rating.get(student);
+        if (!items.containsKey(subject)) throw new IllegalArgumentException();
+        if (!items.get(subject).equals(" ")) items.put(subject, " ");
+        rating.put(student, (HashMap) items);
+    }
+
+    public String search(String student) {
+        if (student.isBlank() || !rating.containsKey(student))
+            throw new IllegalArgumentException();
+        return rating.get(student).toString();
+    }
+
+    void deleteSubject (String subject) {
+        if (subject.isBlank())
+            throw new IllegalArgumentException();
+        for (Map.Entry<String, HashMap> entry : rating.entrySet()) {
+            String student = entry.getKey();
+            Map<String, String> items = rating.get(student);
+            items.remove(subject);
+            rating.put(student, (HashMap) items);
+        }
+    }
+
+    void addSubject (String subject) {
+        if (subject.isBlank())
+            throw new IllegalArgumentException();
+        for (Map.Entry<String, HashMap> entry: rating.entrySet()) {
+            String student = entry.getKey();
+            Map<String, String> items = rating.get(student);
+            items.put(subject, " ");
+            items.remove("");
+            rating.put(student, (HashMap) items);
+        }
+    }
+}
diff --git a/coolName/src/test/java/GroupOfStudentsTest.java b/coolName/src/test/java/GroupOfStudentsTest.java
new file mode 100644
index 0000000..be799b3
--- /dev/null
+++ b/coolName/src/test/java/GroupOfStudentsTest.java
@@ -0,0 +1,101 @@
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class GroupOfStudentsTest {
+
+
+    private GroupOfStudents testGroup() {
+        GroupOfStudents exampleGroup = new GroupOfStudents();
+        exampleGroup.addStudent("Макаров Иван Дмитриевич", "Биология 5, Фармацевтика 3, Политология 1");
+        exampleGroup.addStudent("Мартынов Аскольд Никитевич", "Биология 5, Фармацевтика 3");
+        exampleGroup.addStudent("Алексеев Юлий Станиславович", "Фармацевтика 3, Политология 1");
+        exampleGroup.addStudent("Соловьёв Велор Владленович", "Фармацевтика 3, Философия");
+        return exampleGroup;
+    }
+
+    @Test
+    void addStudent() {
+        GroupOfStudents exampleGroup = testGroup();
+        exampleGroup.addStudent("Веселов Венедикт Донатович", "Биология 5, Философия 4, Геометрия 2");
+        assertEquals("{Геометрия=2, Биология=5, Философия=4}",
+                exampleGroup.search("Веселов Венедикт Донатович"));
+        assertThrows(IllegalArgumentException.class,
+                () -> exampleGroup.addStudent("Веселов Венедикт Донатович", "Биология 5, Философия 4, Геометрия 2"));
+        assertThrows(IllegalArgumentException.class,
+                () -> exampleGroup.addStudent("", "Биология 5, Фармацевтика 3, Политология 1"));
+    }
+
+    @Test
+    void deleteStudent() {
+        GroupOfStudents exampleGroup = testGroup();
+        exampleGroup.deleteStudent("Макаров Иван Дмитриевич");
+        assertEquals(3, exampleGroup.size());
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.deleteStudent(""));
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.deleteStudent("Павлов Сергей Кимович"));
+    }
+
+    @Test
+    void addMark() {
+        GroupOfStudents exampleGroup = testGroup();
+        exampleGroup.addStudent("Павлов Сергей Кимович", "Биология 5, Геометрия, Философия 4");
+        exampleGroup.addMark("Соловьёв Велор Владленович", "Философия", 4);
+        exampleGroup.addMark("Павлов Сергей Кимович", "Геометрия", 5);
+        assertEquals("{Геометрия=5, Биология=5, Философия=4}", exampleGroup.search("Павлов Сергей Кимович"));
+        assertEquals("{Фармацевтика=3, Философия=4}", exampleGroup.search("Соловьёв Велор Владленович"));
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.addMark("", "Геометрия", 5));
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.addMark("Павлов Сергей Кимович", "", 5));
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.addMark("Павлов Сергей Кимович", "Геометрия", -1));
+    }
+
+    @Test
+    void deleteMark() {
+        GroupOfStudents exampleGroup = testGroup();
+        exampleGroup.addStudent("Павлов Сергей Кимович", "Биология 5, Геометрия 3, Философия 4");
+        exampleGroup.deleteMark("Павлов Сергей Кимович", "Философия");
+        exampleGroup.deleteMark("Соловьёв Велор Владленович", "Фармацевтика");
+        assertEquals("{Геометрия=3, Биология=5, Философия= }", exampleGroup.search("Павлов Сергей Кимович"));
+        assertEquals("{Фармацевтика= , Философия= }", exampleGroup.search("Соловьёв Велор Владленович"));
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.deleteMark("", "Биология"));
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.deleteMark("Соловьёв Велор Владленович", ""));
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.deleteMark("Соловьёв Велор Владленович", "Политология"));
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.deleteMark("Красильников Антон Геннадиевич", "Политология"));
+    }
+
+    @Test
+    void changeMark() {
+        GroupOfStudents exampleGroup = testGroup();
+        exampleGroup.changeMark("Макаров Иван Дмитриевич", "Биология", 2);
+        exampleGroup.changeMark("Мартынов Аскольд Никитевич", "Биология", 3);
+        exampleGroup.changeMark("Алексеев Юлий Станиславович", "Политология", 5);
+        assertEquals("{Фармацевтика=3, Биология=2, Политология=1}", exampleGroup.search("Макаров Иван Дмитриевич"));
+        assertEquals("{Фармацевтика=3, Биология=3}", exampleGroup.search("Мартынов Аскольд Никитевич"));
+        assertEquals("{Фармацевтика=3, Политология=5}", exampleGroup.search("Алексеев Юлий Станиславович"));
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.changeMark("", "Политология", 4));
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.changeMark("Алексеев Юлий Станиславович", "", 4));
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.changeMark("Красильников Антон Геннадиевич", "Фармацевтика", 4));
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.changeMark("Алексеев Юлий Станиславович", "Фармацевтика", -4));
+    }
+
+    @Test
+    void deleteSubject() {
+        GroupOfStudents exampleGroup = testGroup();
+        exampleGroup.deleteSubject("Биология");
+        assertEquals("{Фармацевтика=3, Политология=1}", exampleGroup.search("Макаров Иван Дмитриевич"));
+        assertEquals("{Фармацевтика=3}", exampleGroup.search("Мартынов Аскольд Никитевич"));
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.deleteSubject(""));
+    }
+
+    @Test
+    void addSubject() {
+        GroupOfStudents exampleGroup = testGroup();
+        exampleGroup.addStudent("Крюков Климент Игоревич", "");
+        exampleGroup.addSubject("Астрономия");
+        assertEquals("{Астрономия= }", exampleGroup.search("Крюков Климент Игоревич"));
+        assertEquals("{Фармацевтика=3, Астрономия= , Биология=5, Политология=1}", exampleGroup.search("Макаров Иван Дмитриевич"));
+        assertEquals("{Фармацевтика=3, Астрономия= , Биология=5}", exampleGroup.search("Мартынов Аскольд Никитевич"));
+        assertEquals("{Фармацевтика=3, Астрономия= , Политология=1}", exampleGroup.search("Алексеев Юлий Станиславович"));
+        assertEquals("{Фармацевтика=3, Астрономия= , Философия= }", exampleGroup.search("Соловьёв Велор Владленович"));
+        assertThrows(IllegalArgumentException.class, () -> exampleGroup.addSubject(""));
+    }
+}
\ No newline at end of file
diff --git a/coolName/target/classes/GroupOfStudents.class b/coolName/target/classes/GroupOfStudents.class
new file mode 100644
index 0000000..f81b01b
Binary files /dev/null and b/coolName/target/classes/GroupOfStudents.class differ
diff --git a/coolName/target/test-classes/GroupOfStudentsTest.class b/coolName/target/test-classes/GroupOfStudentsTest.class
new file mode 100644
index 0000000..daa1ecf
Binary files /dev/null and b/coolName/target/test-classes/GroupOfStudentsTest.class differ
diff --git a/pom.xml b/pom.xml
index 29ae17c..9ad97b7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,9 +5,13 @@
 
   <groupId>ru.spbstu.insys</groupId>
   <artifactId>programming-lab-example</artifactId>
-  <version>1.0-SNAPSHOT</version>
+    <packaging>pom</packaging>
+    <version>1.0-SNAPSHOT</version>
+    <modules>
+        <module>coolName</module>
+    </modules>
 
-  <properties>
+    <properties>
     <jvm.version>11</jvm.version>
     <junit.jupiter.version>5.8.2</junit.jupiter.version>
     <maven.compiler.source>${jvm.version}</maven.compiler.source>