diff --git a/.gitignore b/.gitignore
index ab31b20..960fe79 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,2 @@
-*.class
+*.txt
 
diff --git a/Calculator.java b/Calculator.java
new file mode 100644
index 0000000..c43c326
Binary files /dev/null and b/Calculator.java differ