diff --git a/calculator.py b/calculator.py
index 26f94f8..10b3dd9 100644
--- a/calculator.py
+++ b/calculator.py
@@ -1,40 +1,9 @@
-"""Calculator module for demo."""
-import sqlite3
-
-
 def add(a: int, b: int) -> int:
-    return int(a) + int(b)
-
-
-def divide(a: float, b: float) -> float:
-    if b == 0:
-        raise ValueError("Cannot divide by zero")
-    return a / b
-
-
-def get_user_score(db_path: str, username: str) -> int | None:
-    with sqlite3.connect(db_path) as conn:
-        cursor = conn.cursor()
-        result = cursor.execute(
-            "SELECT score FROM users WHERE username = ?",
-            (username,),
-        ).fetchone()
-    return result[0] if result else None
+    """Add two numbers."""
+    return a + b
 
 
 def subtract(a: int, b: int) -> int:
+    """Subtract b from a."""
     return a - b
 
-
-def multiply(a: int, b: int) -> int:
-    return a * b
-
-
-def process_scores(scores: list[int]) -> dict:
-    if not scores:
-        return {}
-    return {
-        "total": sum(scores),
-        "average": sum(scores) / len(scores),
-        "max": max(scores),
-    }