#include <iostream>
using namespace std;

double c2f(double celsius, bool debug=false)
{
  // Precondition: 0 < celsius < 100
  if (debug) cout << "Input for celsius was: " << celsius << endl;

  double f = (celsius/5.0)*9.0+32.0;



  // postcondition: 0 < f < 200
  if (debug) cout << "Return for fahrenheit is: " << f << endl;

  return f;
}


int main()

{
	double c,f;
	cout << "How many celsius? ";
	cin >> c;

	f = c2f(c);

	cout << "This is " << f << " fahrenheit" << endl;


	return 0;

}