#include <iostream>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <string>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <stdio.h>
using namespace std;
#define int long long
int MOD = 1000000007;
signed main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	int N;
	cin >> N;
	string res = "0.";
	if (N == 0) {
		cout << 0 << endl;
		return 0;
	}
	else {
		
		int t = 1;
		for (int i = 0; i < N; i++) {
			t *= 10;
			res.push_back((t / 7) + '0');
			t -= (t / 7)*7;
		}
	}
	cout << res << endl;
}