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 (GCC 5.4.1) (judge verdict: Wrong Answer)

// ABC 148-A
// 2019.12.22 bal4u

#include <stdio.h>

int a[3];

int main()
{
	int i, A, B;
	
	scanf("%d%d", &A, &B);
	a[A] = 1, a[B] = 1;
	for (i = 1; i <= 3; ++i) if (a[i] == 0) {
		printf("%d\n", i);
		break;
	}
	return 0;
}