#include<bits/stdc++.h> using namespace std; double a,b,c,d; int main(){ cin>>a>>b>>c>>d; for(double i=-100;i<=100;i+=0.001){ if(fabs(i*i*i*a+i*i*b+i*c+d)<0.0001) printf("%.02lf ",i); } return 0; }