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;

namespace abc148A
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            int A = int.Parse(Console.ReadLine());
            int B = int.Parse(Console.ReadLine());
            if (A == 1 && B == 2)
                Console.WriteLine(3);
            else if (A == 1 && B == 3)
                Console.WriteLine(2);
            else if (A == 2 && B == 1)
                Console.WriteLine(3);
            else if (A == 2 && B == 3)
                Console.WriteLine(1);
            else if (A == 3 && B == 1)
                Console.WriteLine(2);
            else
                Console.WriteLine(1);
        }
    }
}