Task about Vova

Vova's height when wearing both heels and a hat is a cm. When wearing only heels, Vova's height is b cm, and when wearing only a hat, Vova's height is c cm. What is Vova's actual height without heels or a hat?

Input

You will receive a single line containing three natural numbers a, b, and c, separated by spaces. Each number is valid and does not exceed 200.

Output

Output a single number representing Vova's real height.

Examples