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 9.2.1) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main(){
    int a, b, valor=0;
    scanf("%d", &a);
    scanf("%d", &b);
    int vet[3];
    for(int i=1; i <= 3; ++i)
        vet[i]=i;
    
    for(int i=1; i<=3;++i){
        if (vet[i] != a && vet[i] != b)
            valor=vet[i];
    }
    printf("%d\n", valor);
    
    return 0;
}