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Competitions

PP2. Week 1: March 1 - 7

Perimeter of rectangle

Find the perimeter of rectangle.

Input

The integer sides of rectangle a and b (1a, b1000).

Output

Print the perimeter of rectangle.

Time limit 1 second
Memory limit 128 MiB
Input example #1
3 4
Output example #1
14
Author Mykhailo Medvediev