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#描述#
Calculate a + b

#格式#
##输入格式##
The input will be consist of a series of pairs of integers a and b,separated by a space, one pair of integers per line, 0 0 means the end of the input, and do not need to output.

##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#
##样例输入1##

1 5
0 0

##样例输出1##

6

#限制#
1000ms
1024KB

#提示#

#来源#