import java.util.Scanner;
class Lab3{
    public static void main(String [] args){

            Scanner sc = new Scanner(System.in);

            int x;

            System.out.println("Please enter the value of x");

            x = sc.nextInt();

            double result;
            result = (x*x*x-4*(x+20))/2.0;
            System.out.println("F("+x+") = " + result);

            x = x - 1;
            result = (x*x*x-4*(x+20))/2.0;
            System.out.println("F("+x+") = " + result);

            x = x + 2 ;
            result = (x*x*x-4*(x+20))/2.0;
            System.out.println("F("+x+") = " + result);

            System.out.print("Thanks for using my program :)");
        }
}