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 rep(i,n) for (int i = 0; i < (n); ++i)
using namespace std;
typedef long long ll;
using P = pair<int,int>;

int main() {
    int a,b,ans;
    cin>>a>>b;

    if (a==1 && b == 2) ans=3;
    else if(a == 1 && b == 3) ans=2;
    else if(a == 2 && b == 1) ans = 3;
    else if(a==2&&b==3) ans=1;
    else if(a==3&&b==1) ans=2;
    else ans=1;

    cout<<ans<<endl;
}