class Seven {

  public static double f(double x) { return g(x) + Math.sqrt(h(x)); }
  public static double g(double x) { return 4 * h(x); }
  public static double h(double x) { return x * x + k(x) - 1; }
  public static double k(double x) { return 2 * (x + 1); }

  public static void main(String[] args) {
    double x1 = f(2);
    System.out.println( x1 ); 
    double x2 = g(h(2));
    System.out.println( x2 ); 
    double x3 = k(g(2) + h(2));
    System.out.println( x3 ); 
    double x4 = f(0) + f(1) + f(2);
    System.out.println( x4 ); 
  } 
}