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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.io.*;

public class Main {
    public static void main(String[] args)throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        String input = br.readLine();
        int A = Integer.parseInt(input.substring(0, input.indexOf(" ")));
        input = input.substring(input.indexOf(" ")+1);
        String op = input.substring(0, input.indexOf(" "));
        boolean isPlus = op.equals("+");
        input = input.substring(input.indexOf(" ")+1);
        int B = Integer.parseInt(input);

        if(isPlus){
            System.out.println(A + B);
        }
        else{
            System.out.println(A - B);
        }
    }
}