Back to High School Physics

There is an object with an initial velocity of 0 and a constant acceleration. If its velocity after a certain time t is v, then what will its displacement be at time 2t?

Input Specification

The input will contain one test case in each line. Each test case consits of two integers v (−100 ≤ v ≤ 100) and t (0 ≤ t ≤ 200).

Output Specification

For each line of input, print a single integer in one line, denoting the displacement at time 2t.

Sample Input

1. 0 0
2. 5 12

download as text file

Output for Sample Input

1. 0
2. 120

download as text file