using System;

class Squares {
  
  public static void Main(string[] arg) {
    if (arg.Length == 0)
      Console.WriteLine("specify a positive number as an argument");
    else{
      int n = Convert.ToInt32(arg[0]);
      Console.WriteLine("  i    i*i  Sqrt(i)");
      Console.WriteLine("-------------------");
      for (int i = 1; i <= n; i++) {
        Console.WriteLine("{0, 3} {1, 6} {2, 8:f2}", i, i*i, Math.Sqrt(i));
      }
    }
  }
}