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 JavaScript (node.js v5.12) (judge verdict: Accepted)

'use strict'

const main = input => {
	const args = input.trim().split(' ')
	const a = parseInt(args[0], 10)
	const op = args[1]
	const b = parseInt(args[2], 10)

	if (op === '+') {
		console.log(a + b)
	} else {
		console.log(a - b)
	}
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'))