#include <bits/stdc++.h>
using namespace std;

int main(){
    double a,b,c,d;
    cin >> a >> b >> c >> d;
    for (double i = -10000;i <= 10000;i++){
        if(a*1.0*pow(i/100.0,3) + b*pow(i/100.0,2) + c*1.0*i/100.0 + 1.0*d == 0){
            printf("%.2lf ",i/100.0);
        }
    }
    return 0;
}