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: Runtime Error)

using System;

namespace AtCoder
{
    class Program
    {
        static void Main()
        {
            string[] input = Console.ReadLine().Split(' ');
            long a = int.Parse(input[0]);
            long b = int.Parse(input[1]);

            long x = a * b;

            if (a < b)
            {
                long temp = a;
                a = b;
                b = temp;
            }

            long r = a % b;
            while (r != 0)
            {
                a = b;
                b = r;
                r = a % b;
            }

            long result = x / b;

            Console.WriteLine(result);
        }
    }
}