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 (Clang 3.8.0) (judge verdict: Accepted)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

int main()
{
	int A, B;
	scanf("%d", &A);
	scanf("%d", &B);

	int integerArray[3] = { 1, 2, 3 };

	for (int i = 0; i < 3; i++)
	{
		if (A == integerArray[i] || B == integerArray[i])
		{
			continue;
		}
		else
		{
			printf("%d \n", integerArray[i]);
			return 0;
		}
	}
	return 0;
}