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>
#include<math.h>
int main(){
  int a,b,i,j,m,n,x,s;
  scanf("%d%d",&a,&b);
  if(a<=b){
    m=b;
    s=a;
    while(i==0){
    n=m%s;
    if(n==0){
      i=1;
      x=s;
      break;
    }
    else{
      i=0;
      m=s;
      s=n;
    }
    }
     }
  else{
    m=a;
    s=b;
    while(i==0){
    n=m%s;
    if(n==0){
      i=1;
      x=s;
      break;
    }
    else{
      i=0;
      m=s;
      s=n;
    }
  }
  }
  x=a*b/x;
  printf("%d",x);
  return 0;
}