2.15 Image Transformation（图 像 转 换）

                              2.15 Image Transformation

2.15.1 时空限制

           Time limit: 1 Seconds Memory limit: 32768K

2.15.2 题目内容

          The image stored on a computer can be represented as a matrix of pixels. In the RGB (Red-Green-Blue) color system, a pixel can be described as a triplex integer numbers. That is, the color of a pixel is in the format “r g b” where r, g and b are integers ranging from 0 to 255 (inclusive) which represent the Red, Green and Blue level of that pixel. 
           Sometimes however, we may need a gray picture instead of a colorful one. One of the simplest way to transform a RGB picture into gray: for each pixel, we set the Red, Green and Blue level to a same value which is usually the average of the Red, Green and Blue level of that pixel (that is (r + g + b)/3, here we assume that the sum of r, g and b is always dividable by 3). 
            You decide to write a program to test the effectiveness of this method. 

        Input 

          The input contains multiple test cases! 
          Each test case begins with two integer numbers N and M (1≤N, M≤100) m