// editor2
#include <iostream>
using namespace std;
class worker{
    public:
    float calculatedays(float totalwork,float rate){
        if(totalwork<=0||rate<=0||rate>1000)
        return -1;
        return totalwork/rate;
    }
};
class groupworker : public worker{
    public:
    float calculatedays (float totalwork,int numworkers,float rateperworker)
    {
        if (totalwork<=0||numworkers<=0||rateperworker<=0||numworkes>100||rateperworker>100)
        return totalwork/totalrate;
    }
};
int main(){
    float totalwork,rate,rateperworker;
    int numworkes;
    cin>>totalwork>>rate>>numworkes>>rateperworker;
    worker w;
    groupworkes g;
    float daysindividual=w.calculatedays(total,rate);
    float daysgroup=g.calclatedays(totalwork,numworkers,rateperworker);
    if(daysindividual==-1||daysgroup==-1){
        cout<<"Invalid input";
    }else{
        cout<<daysindividual<<endl;
        cout<<daysgroup;
    }
    return 0;
}