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768. Back to High School Physics
Vaqt limiti: 1 sekund
Xotira limiti: 64 MB

  A particle starts moving with constant acceleration. If its velocity after the time t is v, what will its displacement be in twice of that time?

Input

 First line contains two integers - the velocity of the particle v (0  v 100) and the time t (0  t  200), for which the particle gains that velocity.

Output

 Print a single integer in first line denoting the displacement in time 2t.

Samples

Input

Output

1

0 0

0

2

5 12

120

 

Tayyorladi: Azat Yusupov
Text from: e-olimp.com
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