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;
using System.IO;
using System.Linq;
using System.Collections.Generic;
using System.Numerics;

namespace abc148
{
    class Program
    {
        static void Main(string[] args)
        {
           // Console.SetIn(new StreamReader("input.txt"));
            solve_abc148A();
        }
        public static void solve_abc148C()
        {

        }

        public static void solve_abc148B()
        {

        }

        public static void solve_abc148A()
        {
            int a  = Convert.ToInt32(Console.ReadLine());
            int b = Convert.ToInt32(Console.ReadLine());

            if ((a == 1 && b == 2) || (a == 2 &&  b == 1))
            {
                Console.WriteLine(3);
            }
            else if ((a == 1 && b == 3) || (a == 3 && b == 1))
            {
                Console.WriteLine(2);
            }
            else
            {
                Console.WriteLine(1);
            }


        }
    }
}