#include <iostream>
#include <math.h>

using namespace std;

int k;
double a,b,xk = 1;
double *x;

double F(double z)
{
    return pow(z,3)-3*pow(z,2)-2*z+5;
}

int main()
{
   cout << "Podaj a: ";
   cin >> a;
   cout << "Podaj b: ";
   cin >> b;
   cout << "Podaj k: ";
   cin >> k;
   cout << "Podaj xk: ";
   cin >> xk;
   cout << endl;

   x = new double[k];

   if(xk == a) x[0] = b;
   else x[0] = a;

   for(int i=1;i<=k-1;i++)
   {
       x[i] = x[i-1] - F(x[i-1])*(xk-x[i-1])/(F(xk)-F(x[i-1]));
   }
    cout << "Wynik: " << x[k-1] << endl;
}