#include <iostream>
using namespace std;
int a[] = { 1, 4, 2, 8, 5, 7 };
int n;
int main() {
	cin >> n;
	cout << 0;
	if (n >= 1) {
		cout << ".";
		for (int i = 0; i < n; ++i) {
			cout << a[i % 6];
		}
	}
	cout << endl;
	return 0;
}