Help me please!
import java.util.Scanner; abstract class Shape { int width; abstract void area(); } //введите код сюда public class Square extends Shape{ public Square (int x){ width =x; } void area (){ if(width >=0) System.out.println(width *width); } } public class Circle extends Shape { public Circle (int y){ width =y; } void area (){ if (width >=0) System.out.println (width* width* Math.PI); } } public class Program { public static void main(String[ ] args) { Scanner sc = new Scanner(System.in); int x = sc.nextInt(); int y = sc.nextInt(); Square a = new Square(x); Circle b = new Circle(y); a.area(); b.area(); } }