import java.util.*;

public class Project
{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner (System.in);
        double twork = sc.nextDouble();
        double work1=sc.nextDouble();
        int workers = sc.nextInt();
        double work2=sc.nextDouble();
        
        cal(twork,work1,workers,work2);
    }
    public static void cal (double twork,double work1,int workers,double work2)
    {
        if (twork<=0)
        {
            System.out.print("Invalid input");
            return;
        }
        double work1t =0;
        if (work1<=0)
        {
             work1t=-1;
        }
        else
        {
            work1t = twork/work1;
        }
        
       double work2t =0;
        if(workers<=0 || work2<=0)
        {
          work2t =-1;
        }
        else
        {
            work2t=twork/(workers*work2);
        }
       /* if(work1t==-1) System.out.printf("-1");
        else System.out.printf("%.1f%n",work1t);
        
        if(work2t==-1) System.out.printf("-1");
        else System.out.printf("%.1f%n",work2t);*/
        System.out.printf(work1t);
        System.out.printf(work2t);
}}