import java.util.Scanner;
public class Solution
{
    public static void main(String[] args)
    {
        Scanner sc=new Scanner(System.in);
        
        double totalWork, individualWorkRate, workRatePerWorker;
        int numberOfWorkers;
        
        totalWork = sc.nextDouble();
        
        if(totalWork<=0)
        {
            System.out.println("Invalid input");
            return;
        }
        
        individualWorkRate = sc.nextDouble();
        numberOfWorkers = sc.nextInt();
        workRatePerWorker = sc.nextDouble();
        
        if(individualWorkRate<=0 || numberOfWorkers<=0 || workRatePerWorker<=0)
        {
            System.out.print(-1);
            return;
        }
        
        double IndividualWorker = totalWork/individualWorkRate;
        double GroupWorker = totalWork/(numberOfWorkers*workRatePerWorker);
        
        System.out.printf(IndividualWorker);
        System.out.printf(GroupWorker);
    }
}