import java.util.Scanner;
public class Worker{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        double totwork=sc.nextDouble();
        if(totwork<=0){
            System.out.print("Invalid input");
            return;
        }
        double indiworkrate=sc.nextDouble();
        int noofworkers=sc.nextInt();
        double workrateperperson=sc.nextDouble();
        double indiwork=0;
        double combinedwork=0;
        if(indiworkrate<=0){
            System.out.println("-1");
        }
        else{
            indiwork=totwork/indiworkrate;
            System.out.printf(indiwork);
        }
        if(noofworkers<=0||workrateperperson<=0){
            System.out.println("-1");
        }
        else{
            combinedwork=totwork/(noofworkers*workrateperperson);
            System.out.printf(combinedwork);
        }
    }
}