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 (Clang 3.8.0) (judge verdict: Accepted)

#include <stdio.h>

int main() {
  int a, b, c = 1;
  scanf("%d", &a);
  scanf("%d", &b);
  if (a == 1) c = (b == 2) ? 3: 2;
  if (a == 2) c = (b == 1) ? 3: 1;
  if (a == 3) c = (b == 1) ? 2: 1;
  printf ("%d\n", c);
}