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 C++14 (Clang 3.8.0) (judge verdict: Accepted)

#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;

int main(int argc, const char * argv[]) {

    // cinを高速にするためのおまじない
    cin.tie(0);
    ios::sync_with_stdio(false);

    int a;
    int b;
    string op;

    cin >> a >> op >> b;

    if (op == "+") {
        cout << (a + b);
    } else {
        cout << (a - b);
    }

    return 0;
}