text: #include <iostream>
  #include <cmath>
  using namespace std;
  
  
  double f(double x) {return 2*log(2*x);}
  
  int main()
  {
      double x = 1.1;
  
      for (int nit = 0; nit < 2; nit++)
      {
          cout << x << endl;
  
          x = f(x);
      }
  }