// Program from Etter, pg 99, no. 10..

// Timber regrowth.  A problem in timber management is to determine
// how much of an area to leave uncut so that the harvested portion is
// reforested withing a certain perio.  It is assumed that reforestation
// takes place at a known rte per year depending on climate and soil
// conditions.  A reforstation equation expresses the growth as a function
// of the amount of timber standing after harvesting, and the reforestation
// rate.

// For example, if 100 acres are left stading after harvesting, and
// the reforestation rate is 0.05, then 100 + 0.05 x 100 acres are
// forested at the end of the first eyar.  At the end of the second year,
// the number of acres forested is 105 + 0.05 x 105, or 110.25 acres.

// Assume that there are 14,000 acres with 2,500 acres uncut and that the
// reforestation rate is 0.02.  Print a table showing the number of acres
// reforested at the end of each year, for a totoal of 20 years.

// 10. Let the user enter number of acres to be reforested; output number of
//     years required to reforest that number of aces.  Everything else
//     is unchanged (initial number of arres and reforestation rate).

#include <iostream.h>

int main ()

{
	double Acres, Total;
	int Years=0;

	Acres = 2500;
	cout << "Enter the total number of acres to be reforested." << endl;
	cin >> Total;

	while ( Acres <= Total )
	{
		Acres = Acres + 0.02 * Acres;
		Years++;
	}

	cout << "Years needed to reforest " << Total << " acres is " << Years << endl;

	return 0;
}