using System;

public class Program

{

    public static void Main()

    {

        int[] array=new int[]{1,0,1,1,1,1,0,0,0,1,0,0,1,1,1,1,1,1};

        int maxvalue=0;  

        int count=0;

        for(int i=0; i<=array.Length-1; i++)

        {

            if(array[i]==1)

            {

                count++;

                maxvalue=Math.Max(maxvalue,count);

            }

            else

            {

                count=0;

            }

        }

        Console.WriteLine(maxvalue);

    }

}