Problem Description

Problem Description
We divide the HZNU Campus into N*M grids.As you can see from the picture below,the green grids represent the buidings.Given the size of the HZNU Campus,and the color of each grid,you should count how many green grids in the N*M grids.
Input
Standard input will contain multiple test cases.The first line of the input is a single integer T which is the number of test cases.T test cases follow.
The first line of each test case contains two integers n and m(1