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: Accepted)

#include"stdio.h"
#include"math.h"



int main() {
	int a,b,ans=0;
	scanf("%d %d", &a,&b);
	if (a == 1 && b == 2)ans = 3;
	if (a == 1 && b == 3)ans = 2;
	if (a == 2 && b == 1)ans = 3;
	if (a == 2 && b == 3)ans = 1;
	if (a == 3 && b == 2)ans = 1;
	if (a == 3 && b == 1)ans = 2;
	printf("%d", ans);
	return 0;
}