Description

Your task is to Calculate a + b.

Input

Input contains multiple test cases. Each test case consists of a pair of integers a and b ( 0 <= a, b <= 20 ), separated by a space, one pair of integers per line.

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.

1 1

2