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 <limits.h>
//#include <math.h>
#include <stdio.h>

int main(void) {
  int a, b,ans;
  scanf("%d %d",&a,&b);
  switch (a+b)
  {
  case 4:
    ans=2;
    break;
  case 3:
    ans=3;
    break;
  case 5:
    ans=1;
    break;
  default:
    break;
  }
  printf("%d\n",ans);
  return 0;
}