Description

A primary school has issued an initiative to "Plant Trees, Restore Green" to encourage everyone to plant more trees. Given the number of students in each class and the average number of trees planted per person, output the total number of trees planted by the class.

Input Format

Two positive integers, representing the number of students and the average number of trees planted per person.

Output Format

The total number of trees planted.

Sample

50 4

总的棵数：200