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 (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>

using namespace std;

typedef unsigned short ushort;
typedef unsigned int uint;
typedef long long ll;
typedef unsigned long long ull;

template <typename T>
ostream &operator<<(ostream &cout, vector<T> &a){
    for(ull i = 0; i < a.size(); ++i)
        cout << a[i] << " ";
    return cout;
}

template <typename T>
ostream &operator<<(ostream &cout, vector<vector<T> > &a){
    for(ull i = 0; i < a.size(); ++i)
        cout << a[i] << endl;
    return cout;
}

int main()
{
    int a, b;
    char s;
    cin >> a >> s >> b;
    if(s == '+')
        cout << a + b << endl;
    else
        cout << a - b << endl;
    return 0;
}