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

Time Limit: 1000 ms Memory Limit: 65536 KiB

#### 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.

#### Output

For each pair of input integers a and b you should output the sum of a and b, and followed by a blank line.

#### Sample Input

1 5
10 20

#### Sample Output

6

30

HDOJ