#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;
   scanf("%d",&n);

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

   return 0;
}