#include <iostream>
#include <algorithm>
#include <cstdio>
#include <string>

#define ll long long

using namespace std;


int main(){
    
   int d[6]={1,4,2,8,5,7};
   int n;
   cin>>n;

   cout<<0;
   if(n){
       cout<<".";
       for(int i=0;i<n;++i) cout<<d[i%6];
   }
   cout<<endl;

   return 0;
}