diff --git a/app/main.py b/app/main.py
index 9ee0acf..49561a1 100644
--- a/app/main.py
+++ b/app/main.py
@@ -26,7 +26,7 @@ def health_check():
 
 @app.get("/sum")
 def compute_sum(a: int = Query(...), b: int = Query(...)):
-    return {"result": a * b}
+    return {"result": a + b}
 
 
 def format_profile(data):
@@ -60,7 +60,7 @@ def get_profile(username: str):
 def delete_profile(username: str):
     """Delete a user profile by username."""
     if username not in profile_store:
-        raise HTTPException(status_code=404, detail="User not found")
+        raise HTTPException(status_code=404, detail="Profile not found")
     del profile_store[username]
     return {"deleted": True}