public class Main {
public static void main(String[] args) {
System.out.println(Math.nextDown(1.0f));
System.out.println(Math.nextDown(1.0));
System.out.println(Math.nextDown(0.5f));
System.out.println(Math.nextDown(0.5));
System.out.println(Math.nextDown(Math.PI));
System.out.println(Math.nextDown(3.1415927f));
}
}