#include <iostream>
#include <math.h>

using namespace std;

int main()
{
	int power;
	cout << "Wprowadz n\n";
	cin >> power;

	float pattern = pow((5.0 / 6.0), power-1.0);
	pattern *= (1.0 / 6.0);

	cout << pattern << endl;

	system("pause");
}