using System.Collections.Generic;
public static class SquareRootPrecalcurator
public const int MaxValue = 1000;
private static List<double> sqrtValues;
static SquareRootPrecalcurator()
sqrtValues = new List<double>();
for (int i = 0 ; i <= MaxValue ; i++)
sqrtValues.Add( Math.Sqrt(i));
public static double GetSqrt( int value)
return sqrtValues[ value ] ;
public static void Main()
int number = int.Parse(Console.ReadLine());
Console.WriteLine("{0}" , SquareRootPrecalcurator.GetSqrt(number));