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: Runtime Error)

#include <stdio.h>

void main()
{
  	int a,b,c;
  
  	scanf("%d",&a);
    scanf("%d",&b);
  
      	if(a==1)
        {if(a==2)
        {  printf("3");
        }
  			else
            {  printf("2");
            }
        }
       	else if(a==2)
        {
        	if(a==3)
            {  printf("1");
            }
  			else
            { printf("3");
            }
        }
               
       else
     
       {	if(a==1)
       { printf("2");
       }
  			else
            {   printf("1");
            }
       }
            
       
}