题目描述

Your task is to Calculate a + b.

输入格式

Input contains multiple test cases. Each test case contains a pair of integers a and b, one pair of integers per line. A test case containing 0 0 terminates the input and this test case is not to be processed.

输出格式

For each pair of input integers a and b you should output the sum of a and b in one line, and with one line of output for each line in input.

样例 1

输入

1 5
10 20
0 0

输出

6
30

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题目来源：fps-xiao-1001-1015.xml；FPS 共享题包，题包内第 5 题。保留原作者与原赛事署名。