002. Triple Product
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output

Basic math operations are very important in programming applications. In this problem, your task is to calculate the product of two integers, multiplied by three.

Input

The first line of input contains a positive integer a no greater than 2000. The second line of input contains a positive integer b no greater than 2000.

Output

Print a single positive integer c: the product of a and b multiplied by 3.

Example
Input
3
5
Output
45