#include <iostream>
#include <cmath>
using namespace std;
int main(){
    double firstBro, secondBro, thirdBro, father;
    cin>> firstBro>>secondBro>>thirdBro>> father;
    double totalTime= 1/(1/firstBro+1/secondBro+1/thirdBro);
    double Break=totalTime*0.15;
    double allTime= Break+ totalTime;
    cout.setf(ios::fixed);
    cout.precision(2);
    cout<<"Cleaning time: " <<allTime<<endl;
    double finalTime= father-allTime;
    if (finalTime>0){

        cout<< "Yes, there is a surprise - time left -> "<<floor(finalTime)<< " hours."<<endl;
    }else if (finalTime<0){
    cout<<"No, there isn't a surprise - shortage of time -> "<< ceil(abs(finalTime))<<" hours."<<endl;

    }










return 0;
}