#include <iostream>
using namespace std;
double celsiusToFahrenheit(double celsius) {
return celsius * 9.0 / 5.0 + 32.0;
}
int main() {
cout << "C: ";
double celsius;
cin >> celsius;
cout.setf(ios::fixed);
cout.precision(1);
cout << "F: " << celsiusToFahrenheit(celsius) << '\n';
}