### A+B for Input-Output Practice (III)

Time Limit: 1000 ms Memory Limit: 65536 KiB

#### Problem 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 5
10 20
0 0

#### Sample Output

6
30

HDOJ sdut