#include <iostream>
#include <cstdlib>
using namespace std;

int main ()
{
	double miles {0.0};
	cout << "How many miles?\n";
	cin >> miles;

	if (!cin) {
		cerr << "Sorry, that wasn't a number.\n";
		return EXIT_FAILURE;

	}
	if (miles <= 0 || miles >= 100) {
		cerr << "Sorry, that wasn't a legitimate number.\n";
		return EXIT_FAILURE;

	}

	double dollars {3.00 + 3.50 * miles};

	cout << "The fare will be " << dollars << " dollars\n";
	return EXIT_SUCCESS;
}