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 i,a,b,c;
    int s[3]={1,2,3};
    scanf("%d",&a);
    scanf("%d",&b);
    for(i=0;i<3;i++)
    {
        if(a==s[i] || b==s[i])
            s[i]=0;
    }
    for(i=0;i<3;i++)
    {
        if(s[i]!=0)
            printf("%d\n",s[i]);
    }
    return 0;
}