//This program calculates the charges for DVD rentals.
//Every third DVD is free.
#include <iostream>
#include <iomanip>
using namespace std;

int main ()
{
	int dvdCount = 1;		//DVD counter
	int numDVDs;			//number of DVDs rented
	double total = 0.0;		//accumulator
	char current;			//current release, Y or N
	
	//get the number of DVDs.
	cout << "How many DVDs are being rented? ";
	cin >> numDVDs;
	
	//determine the charges.
	do 
	{
		if ((dvdCount % 3) == 0)	
		{
			cout << "DVD #" << dvdCount << " is free!\n";
			continue; //immediately start the next iteration
		}
		cout << "Is DVD #" << dvdCount;
		cout << " a current release? (Y/N) ";
		cin >> current;
		if (current == 'Y' || current == 'y')
			total += 3.50;
		else 
			total += 2.50;	
	} while (dvdCount++ < numDVDs);
	
	//display the total.
	cout << fixed << showpoint << setprecision(2);
	cout << "The total is $" << total << endl;
	return 0;
}