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>
#define F first
#define S second
#define ll long long
#define ld long double
#define pb push_back

using namespace std;

int a,b;

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