You are given the number of legs of three types of animals:

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• Chickens $-$ each of which has 2 legs
• Rabbits $-$ each of which has 4 legs
• Spiders $-$ each of which has 8 legs

Your goal is to write a program that computes the total number of legs among all the animals.

Input

A single line with three non-negative integers $c, r, s$.

• $c$ $-$ the number of chickens
• $r$ $-$ the number of rabbits
• $s$ $-$ the number of spiders

Output

Print a single integer $-$ the total number of legs among all the animals.

Constraints

For all cases, $0\le c, r, s\le 1000$.