diff --git a/app/src/main/java/com/example/simpleparadox/listycity/CityList.java b/app/src/main/java/com/example/simpleparadox/listycity/CityList.java
index 6da242f3..30d9b1d5 100644
--- a/app/src/main/java/com/example/simpleparadox/listycity/CityList.java
+++ b/app/src/main/java/com/example/simpleparadox/listycity/CityList.java
@@ -77,4 +77,8 @@ public void delete(City city) {
     public int countCities() {
         return cities.size();
     }
+
+    public static int addNums(int a, int b){
+        return a + b;
+    }
 }
diff --git a/app/src/test/java/com/example/simpleparadox/listycity/CityListTest.java b/app/src/test/java/com/example/simpleparadox/listycity/CityListTest.java
index 787eab7e..3e43c2e4 100644
--- a/app/src/test/java/com/example/simpleparadox/listycity/CityListTest.java
+++ b/app/src/test/java/com/example/simpleparadox/listycity/CityListTest.java
@@ -93,4 +93,9 @@ void testCountCities() {
 
         assertEquals(1, cityList.countCities());
     }
+
+    @Test
+    void testAddNums() {
+        assertEquals(4, CityList.addNums(1, 3));
+    }
 }
\ No newline at end of file