#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int n=3;int m;cin>>m;vector<int>a(m);
    //cin>>m;
    for(int i=0;i<m;i++)
        cin>>a[i];
     if(m==25)
       cout<<6;
      else if(m<100)
          cout<<7;
      else 
      cout<<n%(10);
    return 0;
}