diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..13566b8
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
diff --git a/.idea/ex1.iml b/.idea/ex1.iml
new file mode 100644
index 0000000..c956989
--- /dev/null
+++ b/.idea/ex1.iml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..c176c3a
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/ex1.iml" filepath="$PROJECT_DIR$/.idea/ex1.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/php.xml b/.idea/php.xml
new file mode 100644
index 0000000..7e5d55a
--- /dev/null
+++ b/.idea/php.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="PhpProjectSharedConfiguration" php_language_level="8.1" />
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/index.php b/index.php
new file mode 100644
index 0000000..40f8244
--- /dev/null
+++ b/index.php
@@ -0,0 +1,33 @@
+<?php
+function isValid($card){
+    $paymentSystem = ["4" => "VISA","5"=>"Mastercard ","220"=>"MIR"];
+
+    $card = str_replace(' ','',$card);
+    $arr = array();
+    for($i = 0; $i < strlen($card); $i++){
+        $arr[$i] = (int)($card[$i]);
+    }
+    for($j = 0; $j < count($arr); $j+=2){
+        $arr[$j]*= 2;
+        if($arr[$j] >= 10){
+            $arr[$j] = $arr[$j] % 10 + intdiv($arr[$j],10);
+        }
+    }
+    if(array_key_exists($card[0],$paymentSystem)){
+        $paymentSystem = $paymentSystem[$card[0]];
+    }
+    elseif(array_key_exists(substr($card,0,3),$paymentSystem)){
+        $paymentSystem = $paymentSystem[substr($card,0,3)];
+    }
+    else{
+        $paymentSystem = "UNKNOWN";
+    }
+    $isvalid = (array_sum($arr) % 10 == 0) ? "true" : "false";
+    return ["isValid" => $isvalid, "paymentSystem"=> $paymentSystem];
+
+}
+$numberOfCard = readline("Введите номер карты:");
+
+print_r(isValid($numberOfCard));
+
+?>