diff --git a/app/src/main/java/hexlet/code/games/Calc.java b/app/src/main/java/hexlet/code/games/Calc.java
index b99d4e8..baf855a 100644
--- a/app/src/main/java/hexlet/code/games/Calc.java
+++ b/app/src/main/java/hexlet/code/games/Calc.java
@@ -58,14 +58,18 @@ public void changeQuestion() {
         this.leftArg = Engine.randomIntValue(leftBorder, rightBorder);
         this.rightArg = Engine.randomIntValue(leftBorder, rightBorder);
         int numberOfOperation = Engine.randomIntValue(leftBorderOfOperation, rightBorderOfOperation);
+
+        final int startPlus = 1;
+        final int startMinus = 2;
+        final int startMultiplication = 3;
         switch (numberOfOperation) {
-            case 1:
+            case startPlus:
                 plus();
                 break;
-            case 2:
+            case startMinus:
                 minus();
                 break;
-            case 3:
+            case startMultiplication:
                 multiplication();
                 break;
             default: