using namespace std;

#include <iostream>

int Years_To_Millionaire (double base, double rate);

int Years_To_Millionaire (double base, double rate)
    // Returns number of years to become a millionaire if you start
    // with base dollars and invest it at annual interest rate
{
    double total;
    int years;

    years = 0;
    total = base;
    while (total < 1000000.0)
    {
	total *= (1.0 + rate);
	years++;
    }
    return years;
}

int main ()
{
    double initial_investment, annual_rate;

    // Get information from user
    
    cout << "Initial investment: ";
    cin >> initial_investment;
    cout << "Annual interest rate: ";
    cin >> annual_rate;

    // Compute number of years to make a million
    
    if (initial_investment <= 0.0)
	cout << "\nSorry, you'll never become a millionaire\n"
	     << "by investing a non-positive amount.\n";
    else if (initial_investment >= 1000000.0)
	cout << "\nYou're already a millionaire.\n";
    else if (annual_rate <= 0.0)
	cout << "\nSorry, you'll never become a millionaire\n"
	     << "by investing at a non-positive rate.\n";
    else
        cout << "\nYou'll be a millionaire in "
	     << Years_To_Millionaire (initial_investment,
				      annual_rate / 100.0)
	     << " years.\n";
}