A. A+-B
time limit per test
1 second
memory limit per test
64 megabytes
input
stdin
output
stdout

You are given the integer numbers A and B. Output A + B or A - B.

Input

The first line contains two numbers A, B separeted by a single space ( - 263 ≤ A, B < 263).

Output

Output one integer number: A + B or A - B.

Examples
Input
15 27
Output
42
Input
100 58
Output
42