#include <iostream>

using namespace std;

void displayHi()
{
	cout << "Hi\n";
} 

void displayAsMoney(double money)
{
	int previousPrecision = cout.precision();
	cout.precision(2);
	cout.setf(ios_base::fixed);
	cout << "$" << money;
	cout.precision(previousPrecision);
	cout.unsetf(ios_base::fixed);

}

double squareRoot(double X)
{
    double result;
    double S = 2.0;
    double AbsolutePower;


    result = (X/S + S)/2.0;
    AbsolutePower = result - S;
    while( fabs(AbsolutePower) > .00000001)
    {
        S = result;
        result = (X/S + S)/2.0;
        AbsolutePower = result - S;
    }

	return result;
}


void main()
{
	//function call
	displayHi();
	displayAsMoney(34535.2345);
	cout << endl;

	int x;
	cin >> x;
	cout << squareRoot(x) << endl;

	double balance = 500;
	double payment = 27;

	while(balance > 0)
	{
		balance -= payment;
		if(balance >= 0)
		{
			cout <<balance << endl;
		}
		else
		{
			cout << 0;
		}
	}
	cout << "Last Payment = " << payment + balance;
	
}