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

int main()
{
	int pounds {0};
	cout << "How many pounds (whole number, at least 1) does it weigh?\n";
	cin >> pounds;

	if (!cin) {
		cerr << "Sorry, that wasn't a valid whole number.\n";
		return EXIT_FAILURE;   //pounds dies here; minutes not born yet.
	}

	if (pounds < 1) {
		cerr << "Sorry, the weight must be at least 1 pound.\n";
		return EXIT_FAILURE;   //pounds dies here; minutes not born yet.
	}

	//Formula from David Foster Wallace, "Consider the Lobster".
	int minutes {10 + 3 * (pounds - 1) - 3};

	//Simpler expression with the same value:
	//int minutes {4 + 3 * pounds};

	cout << "Simmer the soft shell lobster for "
		<< minutes << " minutes.\n";

	return EXIT_SUCCESS;   //pounds and minutes die here.
}