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)

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

int main() {
	
	int A;
	int B;
	int ans;

	scanf("%d", &A);
	scanf("%d", &B);

	if (A + B == 3) {
		ans = 3;
	}
	else if (A + B == 4) {
		ans = 2;
	}
	else if (A + B == 5) {
		ans = 3;
	}
	
	printf("%d", ans);

	return 0;
}