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<iostream>
#include<vector>
#include<string>
#include<algorithm>
#include<queue>
#include<cmath>
#include<climits>
#include<set>
#include<map>
#define ll long long
using namespace std;

int main() {
	ll a,b;
	cin >> a >> b;
	if (a==1&&b==2) {
		cout << 3 << endl;
	}
	else if (a == 1 && b == 3) {
		cout << 2 << endl;
	}
	else if (a == 2 && b == 1) {
		cout << 3 << endl;
	}
	else if (a == 2 && b == 3) {
		cout << 1 << endl;
	}
	else if (a == 3 && b == 2) {
		cout << 1 << endl;
	}
	else if (a == 3 && b == 1) {
		cout << 2 << endl;
	}

}