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>

int main(){
    int a, b, c;

    scanf("%d", &a);
    scanf("%d", &b);

    if(a == 1 || b == 1){
        if(a == 2 || b == 2){
            printf("%d\n", 3);
        }
        else {
            printf("%d\n", 2);
        }
    }
    else {
        printf("%d\n", 1);
    }


    return 0;
}