Joisino wants to evaluate the formula "A op B". Here, A and B are integers, and the binary operator op is either `+` or `-`. Your task is to evaluate the formula instead of her.

Constraints

* 1≦A,B≦10^9
* op is either `+` or `-`.

Input

The input is given from Standard Input in the following format:


A op B


Output

Evaluate the formula and print the result.

Examples

Input

1 + 2


Output

3


Input

5 - 7


Output

-2
import sys

def main():
    arg = raw_input().split(" ")
    a = int(arg[0])
    b = int(arg[2])
    op = arg[1]
    if a < 1 or b > 10 **9:
        return 0

    if op == "+":
        return a + b
    elif op == "-":
        return a - b
    else:
        return 0

print main()
