228 - Strange Multiplication

Strange Multiplication

Time Limit: 1 sec


The Problem

Shawon is a student of Programming School and Mr. Nezam is teacher of this school. Shawon allways multiply two number in strange way which is not a right way. This multiplication did not understand Mr. Nezam. Can you help Mr. Nezam to find the strange multiplication result. The strange multiplication are...


2 x 3 = 1

3 x 4 = 5

4 x 5 =11




M x N = ?


Your task is to find the strange multiplication result of two integer numbers M and N.



The Input

The input file contains 2 integer numbers M, and N (1<M < 1000, 1<N<1000).


The Output

Output will show the strange multiplication result in a separate line.


Sample Input

 3 4


Sample Output






Problem Setter: Shahin ShamS