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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
class MainClass {
	public static void Main(string[] args){
    	int a = int.Parse(Console.ReadLine());
      	int b = int.Parse(Console.ReadLine());
      	int[] ans = { 1,2,3 };
		foreach(var i in ans){
          if(i != a && i != b){
            Console.WriteLine(i);
            break;
          }
        }
    }
}