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: Wrong Answer)

#include <iostream>
#include <cmath>
using namespace std;

#define rep(i,a,b) for(auto (i)=a;i<b;i++)
#define list(i,N) for(auto (i)=0;i<N;i++)

typedef long long ll;

int main(){

	ios_base::sync_with_stdio(0);
	cin.tie(0);

	int A; cin >> A;
	int B; cin >> B;
	if(A==1){
		if(B==2) cout << "3";
		else cout << "2";
	}else if (A==2){
		if(B==1) cout << "3";
		else cout << "2";
	}else {
		if(B==1) cout << "2";
		else cout << "1";
	}


	return 0;
}