import java.util.Scanner;
class Worker{
    static void individual(double totalWork,double inWorkrate){
        double days=totalWork/inWorkrate;
        System.out.println(days);
    }
    static void group(double totalWork,double workRperworker,int numOfWorkers){
        double days=totalWork/(numOfWorkers*workRperworker);
        System.out.println(days);
    }
    public static void main(String[]args){
        Scanner sc=new Scanner(System.in);
        double totalWork=sc.nextDouble();
        double inWorkrate=sc.nextDouble();
        int numOfWorkers=sc.nextInt();
        double workRperworker=sc.nextDouble();
        if(totalWork>0 && inWorkrate>0 && numOfWorkers>0 && workRperworker>0){
        individual(totalWork,inWorkrate);
        group(inWorkrate,workRperworker);
        }else{
            System.out.println("Invalid input");
        }
    }
}