#include <iostream>
using namespace std;
int main() {
	double a;
	cin >> a;
	if (a >= 30) {
		cout << "Fail";
	}
	else if (a <= 10) {
		cout << a * 0.80 + 0.20 << "0";
	}
	else if (10 < a <= 20) {
		cout << a * 0.75 + 0.20 << "0";
	}
	else if (20 < a <= 30) {
		cout << a * 0.70 + 0.20<<"0";
	}
	return 0;
}