#include<iostream>

#include<cstdio>

using namespace std;

double a, b, c, d;

double f(double x){ return a*x*x*x + b*x*x + c*x + d; }

void half(double l, double r){

    if (r - l <= 0.001){ printf("%.2lf ", l); return; }

    double mid = (l + r) / ;

    double ans_l, ans_r;

    ans_l = f(l)*f(mid);    ans_r = f(r)*f(mid);

    if (f(mid) == )printf("%,2lf ", mid);

    if (f(r) == )printf("%.2lf ", r);

    if (ans_l < )half(l, mid);

    else if (ans_r < )half(mid, r);

}

int main(){

    cin >> a >> b >> c >> d;

    for (double i = -; i <= ; ++i){

        if (f(i)*f(i + ) <= ){ half(i, i + 1.0); }

    }

    cout << endl;

}