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 long long ll;
typedef unsigned long long ull;
typedef vector<long long> vll;

int main()
{
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
  int A;
  int B;
  char op;

  cin >> A >> op >> B;

  int ans = 0;
  if (op == '+')
    {
    ans = A + B;
    }
  else if (op == '-')
    {
    ans = A - B;
    }
 cout << ans << endl;

  return 0;
}