Problem:
Score: 100 points

Problem Statement

Takahashi is solving quizzes. He has easily solved all but the last one.

The last quiz has three choices: 1, 2, and 3.

With his supernatural power, Takahashi has found out that the choices A and B are both wrong.

Print the correct choice for this problem.

Constraints

Each of the numbers A and B is 1, 2, or 3.

A and B are different.

Input

Input is given from Standard Input in the following format:

A
B

Output

Print the correct choice.

Sample Input 1

3
1

Sample Output 1

2

When we know 3 and 1 are both wrong, the correct choice is 2.

Sample Input 2

1
2

Sample Output 2

3

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

"use strict"
function main(arg) {
    var text = arg.trim().split("\n").map(Number).sort()
    for (var i = 1; i <= 3; i++) {
        if (!includeValue(i, text)) {
            console.log(i)
            break
        }
    }
}

function includeValue(x, arr) {
    for (var i = 0; i < arr.length; i++) {
        if (arr[i] === x) {
            return true
        }
    }
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));