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 Contest148
{
	class Program
	{
		static void Main(string[] args)
		{
			int[] nums = { 1, 2, 3 };
			int a = int.Parse(Console.ReadLine());
			int b = int.Parse(Console.ReadLine());
			int ans = 0;

			for (int i = 0; i < nums.Length; i++)
			{
				if (nums[i] != a & nums[i] != b)
				{
					ans = nums[i];
				}
			}

			Console.WriteLine(ans);
		}
	}
}