#include <iostream.h>
#include <math.h>

//using namespace std;

void main()
{
	const double g=9.8;
	const double pi=3.142;
	double period;
	cout << "Please enter a period in seconds: ";
	cin >> period;
	double x = period/2*pi;
	//cout << "\n" << x << endl;
	double y = pow(x,2);
	double length = g*y;

	cout << "\n\nThe length covered for the period entered is: "<<length<<endl;
	return;
}