diff --git a/main.cpp b/main.cpp
index 054592a..7a123e4 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,7 +1,7 @@
 #include <iostream>
 
 int calculate(int a, int b) {
-    return a + b;
+    return a + o;
 }
 
 int main() {