#include<bits/stdc++.h>
using namespace std;
int main()
{
	double r,a,b,h;
	cin>>r>>a>>b>>h;
	if(b>=2*r){
		cout<<"Drop";
		return 0;
	}else{
		cout<<"Stuck"<<endl;
		double x=(h*b)/(a-b);
		double n=sqrt(h*h+(a-b)*(a-b)/4);
		double p=(r*n)/((a-b)/2)-x;
		printf("%0.10lf",p);
	}
}