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: Wrong Answer)

#include"stdio.h"
int main()
{
  int n,m,sum1,sum2;
  scanf("%d%d",&n,&m);
  if(n>m)
  {
    sum1=n-m;
    printf("%d\n",sum1);
  }
  else
  {
    sum2=n+m;
    printf("%d\n",sum2);
  }
  return 0;
}