#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int N; cin >> N;
    cout << 0;
    if(N == 0) {
        cout << endl;
    } else {
        cout << ".";
        int a[] = {1, 4, 2, 8, 5, 7};
        rep(i,N) cout << a[i % N]; cout << endl;
    }
}