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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?
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).
For each line of input, print a single integer in one line, denoting the displacement at time 2t.
Output for Sample Input
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