Problem:
Score : 100 points

Problem Statement

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.

Sample Input 1

1 + 2

Sample Output 1

3

Since 1 + 2 = 3, the output should be 3.

Sample Input 2

5 - 7

Sample Output 2

-2

Solution in Python (2.7.6) (judge verdict: Runtime Error)

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import sys

def read_data():
    lines = [line.rstrip() for line in sys.stdin]
    ns = [int(n) for n in lines[1].split()]
    ms = []
    for line in lines[3:]:
        num, sec = line.split()
        ms.append((int(num)-1, int(sec)))
    return ns, ms

def main():
    ns, ms = read_data()
    for (drink_num, drink_sec) in ms:
        result = sum(ns) - ns[drink_num] + drink_sec
        print result


if __name__ == "__main__":
    main()