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)

function Main(input) {
    var A = parseInt(input[0], 10);
    var B = parseInt(input[1], 10);

    var list = [1, 2, 3];
    var result = list.filter(n => n !== A && n !== B);

    console.log(result[0]);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8").trim().split(/\n|\s/));