The input will consist of a series of pairs of integers a and b, separated by a space, one pair of integers per line.

For each pair of input integers a and b you should output the sum of a and b, and followed by a blank line.

1 5
10 20

6

30


 提交 2480 正确 1467 格式错误 567 答案错误 168 时间超限 6 输出超限 133 运行错误 29 编译错误 110