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<math.h>
#include<limits.h>
#include<assert.h>
#include<stdbool.h>
#include<stddef.h>
#include<stdint.h>
#include<string.h>
#include<unistd.h>
#include<stdlib.h>

#include<ctype.h>
#include<time.h>
typedef long long ll;
#define pi 3.14159
int main()
{ 
int x,y;
scanf("%d %d",&x,&y);
printf("%d\n",6-x-y);



return 0;
}