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>
#include <math.h>
#include <string.h>
#define yes "Yes\n"
#define no "No\n"
//int m,n;
//int i,j,k,l;
int a,b,c,d,e,f,g;
//int sum,total;
//long long int ;
//float ;
//double ;
//char a[101],b[101],s[101],t[101],u[101];
int main(void){
    scanf("%d %d",&a,&b);
    if (a==1)
    {
        if (b==2)
        {
            printf("3\n");
        } else
        {
            printf("2\n");
        }
    }
    if (a==2)
    {
        if (b==1)
        {
            printf("3\n");
        } else
        {
            printf("1\n");
        }
    }
    if (a==3)
    {
        if (b==2)
        {
            printf("1\n");
        } else
        {
            printf("2\n");
        }
    }
    return 0;
}