#include <bits/stdc++.h>
using namespace std;

int main() {
	double b, n, s, h;
	cin >> n;
	s = n * n * 1.0;
	h = n + (n - 1) + 4;
	b = h * 1.0 / s * 100;
	cout << fixed << setprecision(1) << b << "%";
	return 0;
}

1

#include <bits/stdc++.h>
using namespace std;

int main() {
	int n, a, b;
	double c;
	cin >> n;
	a = n * 2 + 3;
	b = n * n;
	c = a * 1.0 / b;
	c *= 100;
	cout << fixed << setprecision(1) << c;
	cout << "%";
	return 0;
}