Description:
Calculate a + b.
Input:
The input will consist of a series of pairs of integers a and b,separated by a space, one pair of integers per line. A line containing 0 0 terminates the input and this line is not to be processed.
Output:
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.
Sample Input:
1 5
3 3
0 0
Sample Output:
6
6
Note:
本题由旧版NOJ导入，来源：HDUOJ
