A+B for Input-Output Practice1(入门)

Description

  Your task is to Calculate a + b.

Input

  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.

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

1 510 200 0

Sample Output

630

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