diff --git a/BE/Calculator.java b/BE/Calculator.java
index d517f79..f8ac59e 100644
--- a/BE/Calculator.java
+++ b/BE/Calculator.java
@@ -10,4 +10,10 @@ 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 multiple(int a, int b){
+        return a*b;
+    }
 }