Problem Statement

Takahashi has rolled three dice. They are showing numbers $a$, $b$, and $c$ on the top faces.

Find the sum of the numbers on the bottom faces.

Here, each of these dice is a standard cubic die, where the sum of the numbers on opposite faces is $7$.

Constrains

• $1 \leq a, b, c \leq 6$
• All values in input are integers.

Input

Input is given from Standard Input in the following format:

a b c

Output

Print the sum of the numbers on the bottom faces of the three dice.