diff --git a/BE/Calculator.java b/BE/Calculator.java
index d517f79..4353b4e 100644
--- a/BE/Calculator.java
+++ b/BE/Calculator.java
@@ -10,4 +10,13 @@ public static void main(String[] args) {
     private static int add(int a, int b) {
         return a + b;
     }
+
+    private static int minus(int a, int b){
+   	return a - b;
+    }
+
+    private static int multiply(int a, int b) {
+    	return a * b;
+    }
+
 }