import java.util.Scanner;
class Gravitational
{
public static void main(String[] args)
{
Scanner in = new Scanner (System.in);
double GPE = 0;
double m = 0;
double h = 0;
System.out.println("Mass:");
m = in.nextDouble();
System.out.println("Height/Distance of reference point:");
h = in.nextDouble();
GPE = m * 9.8 * h;
System.out.println("Gravitational Potential Energy:" + GPE);
}
}