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 10.0.0) (judge verdict: Accepted)

#include <stdio.h>

int main (){
	int a, b;
	scanf("%d %d", &a, &b);
	if (a+b<=5){
		printf ("%d", 6-a-b);
	}
	else {
		printf("no answer");
	}
	return 0;
}