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<stdlib.h>
int cmp(const void * a, const void *b){return *(int*)a-*(int*)b;}
int main(){
    int a[2];
    scanf("%d%d",&a[0],&a[1]);
    qsort(a,2,sizeof(int),cmp);
    if(a[0] == 1 && a[1] == 2)
        puts("3");
    else if(a[0] == 1 && a[1] == 3)
        puts("2");
    else 
        puts("1");
    return 0;
}