#include <iostream>
using namespace std;

int main()
{
	double speed;
	cin >> speed;
	
	if (speed <= 10)
		cout << "Slow" << endl;
	else if (speed < 50)
		cout << "Average" << endl;
	else if (speed < 150)
		cout << "Fast" << endl;
	else if (speed < 1000)
		cout << "Ultra fast" << endl;
	else
		cout << "Extremely fast" << endl;
}