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)

// 標準入力
using System;
public class Program{
    public static void Main(){
        var a=0 ;
        var b=0;
        var c=0;
        a = int.Parse(Console.ReadLine());
        b = int.Parse(Console.ReadLine());
        if(a*b==2){
            c=3;
        }else if(a*b==3){
            c=2;
        }else if(a*b==6){
            c=1;
        }
        Console.WriteLine(c);
    }
}