diff --git a/src/calculator.py b/src/calculator.py
index da4a182..e4e6afd 100644
--- a/src/calculator.py
+++ b/src/calculator.py
@@ -8,5 +8,15 @@ def subtract(left: int, right: int) -> int:
     return left - right
 
 
+def clamp(value: int, low: int, high: int) -> int:
+    if low > high:
+        raise ValueError
+    if value < low:
+        return low
+    if value > high:
+        return high
+    return value
+
+
 def clamp_to_byte(value: int) -> int:
     return max(0, min(255, value))