#include<iostream>
using namespace std;
int main(){
    int n;
    int a[6] = {1,4,2,8,5,7};
    cin>>n;
    if(!n){
        cout<<0<<endl;
        return 0;
    }
    else cout<<"0.";
    for(int i=0;i<n;i++)cout<<a[i%6];
    cout<<endl;
    return 0;
}