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"

using namespace std;

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define PN 6700417 

int main(){
    int i;
    //入力
    int a;
    int b;
    cin>>a;
    cin>>b;

    //処理

    //出力
    if((a==1||a==2)&&(b==1||b==2))cout<<3<<endl;
    else if((a==1||a==3)&&(b==1||b==3))cout<<2<<endl;
    else cout<<1<<endl;
    

}