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)

/*
  "I knew I shouldn't have gotten out of bed today."
   - Squidward Tentacles
*/
#include<bits/stdc++.h>
using namespace std;

typedef long long LL;
typedef pair<LL,LL> p64;
typedef vector<LL> v64;

#define pb           push_back
#define pf           push_front
#define mp           make_pair
#define ff           first
#define ss           second
#define rep(i,s,e)   for(int i=s;i<=e;i++)
#define brep(i,s,e)  for(int i=s;i>=e;i--)
#define mem(x,y)     memset(x,y,sizeof(x))
#define DANGER       std::ios::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);

int main()
{
   DANGER 
   int a,b,c;
   cin>>a>>b;
   int x[4]={0};
   x[a]=1;
   x[b]=1;
   int res;
   for (int i = 1; i < 4; i++)
   {
      if(x[i]==0)
      res=i;
   }

   cout<<res<<"\n";
   
}