UVaOJ10071

Problem
B

Back to High School
Physics

Input: standard input

Output: standard output

A particle has initial velocity and constant acceleration. If its velocity
after certain time is v then what will its displacement be in twice of that
time?

Input

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

For each line of input print a single integer in one line denoting the
displacement in double of that time.

Sample
Input

Sample
Output