78. [ CPE ] Back to High School Physics

Task Description
Back to High School Physics
A particle has initial velocity and acceleration. If its velocity after certain time is v then what will its displacement be in twice of that time?
Input Format
The input will contain two integers in each line. Each line makes one set of input. These two integers denote the value of v (−100 ≤ v ≤ 100) and t (0 ≤ t ≤ 200) (t means at the time the particle gains that velocity)
Output Format
For each line of input print a single integer in one line denoting the displacement in double of that time.
Sample Input

1
2
0 0
5 12

Sample Output

1
2
0
120