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 gcd(long a,long b);

int main()
{
  long A,B;
  long g,ans;

  scanf("%ld",&A);
  scanf("%ld",&B);

  if(A > B){
    g = gcd(A,B);
  }
  else{
    g = gcd(B,A);
  }
  ans = (A*B)/g;

  printf("%ld",ans);

}

int gcd(long a,long b){
  int s;
  while(a%b != 0){
    s = b;
    b = a%b;
    a = s;
  }
    
  return b;
}