using System;
namespace TestApplication
{
internal class Program
{
    private static void Main(string[] args)
    {
        var array = new[] {1, 5, 2, 2, 2, 2, 4, 5, 5, 5, 1, 1, 2, 5};
        int maxStreak = 0, curStreak = 0;

        for (var i = 1; i < array.Length; i++)
        {
            if (array[i] == array[i - 1]) curStreak++;
            else
            {
                if (curStreak >= maxStreak) maxStreak = curStreak;
                curStreak = 0;
            }
        }

        Console.WriteLine(maxStreak);
    }
}
}