using System;

class Task
{
  public static void Main (string[] args) 
  {
    int a, b, h;

    a = Int32.Parse(Console.ReadLine());
    b = Int32.Parse(Console.ReadLine());
    h = Int32.Parse(Console.ReadLine());

    for(var x = a; x <= b; x += h)
    {
      double y;
      if(x == 1 || x == -1)
        y = 1;
      else if(x >= 0)
        y = -1.0 / (1.0 - x);
      else
        y = 1.0 / (1.0 + x);
      Console.WriteLine($"x = {x}\ty = {y}");
    }
  }
}