#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
using ll = long long;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n;
    cin >> n;

    if (n == 0) {
        cout << 0 << endl;
        exit(0);
    }

    cout << "0.";

    int a = 1;
    for (int i = 0; i < n; i++) {
        a *= 10;
        int d = a / 7;
        a %= 7;
        cout << d;
    }

    cout << endl;

    return 0;
}