#define _USE_MATH_DEFINES
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string>
#include<iostream>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include <sstream>
#include<iomanip>
#include <ctype.h>
#include <fstream>
#include <cassert>
//#include <bits/stdc++.h>
using namespace std;

//#include<bits/stdc++.h>


	
int main() {
	
	int n;
	cin >> n;
	if (!n) {
		cout << 0 << endl; return 0;
	}

	cout << "0."  ;
	int y = 10;
	for (int i = 0; i < n; i++) {
		cout << y / 7;
		y = y % 7;
		y *= 10;

	}
	cout << endl;
	return 0;
}