//サンプルが大ヒント
#include <iostream>
using namespace std;

int a[6] = {1, 4, 2, 8, 5, 7};
int n;

int main() {
	cin >> n;
	
	cout << "0";
	if (n == 0) return 0;
	
	cout << ".";
	for (int i = 0; i < n; i++) {
		cout << a[i % 6];
	}
	cout << endl;
	return 0;
}