#include <iostream>
using namespace std;
 
int main() {
	const double km_h2m_s = 1000.0/(60*60);
	const double km_h2cm_s = km_h2m_s * 100;
	const double km_h2in_min = km_h2cm_s / 2.54 * 60;
 
	double km_h;
	cout << "Wpisz predkosc w km/h: " << flush;
 
	if (cin >> km_h) { // Prymitywna obsługa błędów.
		cout << endl;
		cout << km_h << " km/h = " << km_h * km_h2m_s    << " m/s\n";
		cout << km_h << " km/h = " << km_h * km_h2cm_s   << " cm/s\n";
		cout << km_h << " km/h = " << km_h * km_h2in_min << " in/min\n";
	}
	cout << endl;
 
	return 0;
}
 

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