#include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define UNIQUE(v) v.erase( unique(v.begin(), v.end()), v.end() );
using namespace std;
using ll = long long;

int a[] = {1, 4, 2, 8, 5, 7};

int main(){
    int n;
    cin >> n;

    string ans = "0";
    if(n != 0) ans += ".";
    rep(i, n){
        ans += to_string(a[i%6]);
    }

    cout << ans << endl;
}