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

int main()
{
	cout << "How many nights is your trip\n";
	int nights {0};
	cin >> nights;

	if (!cin) {
		cerr << "Invalid number inputted.\n"
		     << "Please input the amount of nights your" 
		     << "trip is\n";
	}
	if (nights == 0) {
		cout << "You will not be staying overnight so no need to bring any toothpaste.\n";
		return EXIT_SUCCESS;
	}
	int toothpaste {0};
	for(int i {1}; i <= nights; ++i) {
		cout << "For night " << i << ", brush at night "
		     << "and in the morning.\n";
		toothpaste += 2;
	}
		cout << "You will need enough toothpaste to brush your teeth " << toothpaste << " times.\n";
		return EXIT_SUCCESS;
}