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.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ABC148A
{
	class Program
	{
		static void Main(string[] args)
		{
			int a, b,s;
			s = 0;
			a = int.Parse(Console.ReadLine());
			b = int.Parse(Console.ReadLine());
			if ((a<3)&&(b<3))
			{
				s = 3;
			}
			else if (((a < 2) && (b > 2)) || ((a > 2) && (b < 2)))
			{
				s = 2;
			}
			else
			{
				s = 1;
			}
			Console.Write(s);
			Console.ReadKey();
		}
	}
}