using System;

namespace Interest
{
	/// <summary>
	/// Summary description for Class1.
	/// </summary>
	class Class1
	{
		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		/// 
		static double interest (double loan, double mpr, double payment, int num_months)
		{
			if (loan <= 0) 
			{
				return 0;
			}
			else 
			{
				double interest_this_month = 0;
				double remaining_loan = loan;
				interest_this_month = loan * mpr;
				remaining_loan = remaining_loan - (payment-interest_this_month);
         
				Console.WriteLine (num_months);
				return interest_this_month + interest (remaining_loan, mpr, payment, num_months+1);
			}
		}
		[STAThread]
		static void Main(string[] args)
		{
			double original_loan, mpr, payment;
			double min_payment;
			string ol, mp, pay;
			Console.WriteLine ("Enter loan amount");
			ol = Console.ReadLine();
			Console.WriteLine ("Enter the APR");
			mp = Console.ReadLine();
			original_loan = Double.Parse (ol);
			mpr = (Double.Parse(mp)*0.01)/12;
			min_payment = original_loan*mpr;
			Console.WriteLine ("Enter payment of at least "+min_payment);
			pay = Console.ReadLine();
			payment = Double.Parse(pay);
			double total_interest = interest (original_loan, mpr, payment, 0);
			Console.WriteLine("You owe $"+total_interest+" sucker!");
		}
	}
}