using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        bool[] array = new bool[4];

        array[0] = true;

        array[1] = true;

        array[3] = true;

        Console.WriteLine(array.Length);

        int i = FindFreePlace(array, true, 3);

        Console.WriteLine(i);   

    }

    public static int FindFreePlace(bool[] places, bool isRotary, int neededPlaces)

    {

        int count = 0;

        int numberOfPlaces = places.Length;

        if(isRotary)

        {

            List<bool> itemsList = places.ToList();     

            for (int index = 0; index < numberOfPlaces; index++)

            {

                if(places[index])

                {

                    itemsList.Add(true);                

                }

                else

                {

                    break;

                }

            }

            places = itemsList.ToArray();

            numberOfPlaces = places.Length;

        }

        for (int index = 0; index < numberOfPlaces; index++)

        {

            if(places[index])

            {

                count++;    

            }       

            else

            {

                count = 0;

            }

​

            if(count == neededPlaces)

            {

                return index + 1 - neededPlaces;

            }   

        }

        return -1 ;

    }   

}