diff --git a/src/main/java/Cat.java b/src/main/java/Cat.java
new file mode 100644
index 0000000..49ecf8b
--- /dev/null
+++ b/src/main/java/Cat.java
@@ -0,0 +1,2 @@
+public class Cat {
+}
diff --git a/src/main/java/Solution.java b/src/main/java/Solution.java
index f2bdac1..6243773 100644
--- a/src/main/java/Solution.java
+++ b/src/main/java/Solution.java
@@ -1,6 +1,6 @@
 public class Solution {
     public static int add(int a, int b) {
-        return a - b;
+        return a + b;
     }
 
     public static void main(String[] args) {