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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
#include <vector>
#include <iostream>
#include <map>
#include <cmath>
#include <string>
using namespace std;

#define rep(i, n) for (int i = 0; i < (n); ++i)
typedef long long ll;

int main() {
  vector<int> nums = {1,2,3};
  int A, B;
  cin >> A >> B; 
  
  int ans = 0;
  for(auto var : nums)
  {
     if ((A != var) && (B != var)) 
        ans = var;
  }
  cout << ans;
  return 0;
}