using System;

class Program
{
    static void Main(string[] args)
    {
        string[] input = Console.ReadLine().Split(' ');
        int n = int.Parse(input[0]);
        int p = int.Parse(input[1]);

        int[] a = Array.ConvertAll(Console.ReadLine().Split(' '), int.Parse);

        int longest_stay = 0, current_stay = 0;
        int start = 0, end = 0, budget = p;

        while (end < n)
        {
            if (budget >= a[end])
            {
                budget -= a[end];
                current_stay++;
                end++;
            }
            else if (start == end)
            {
                start++;
                end++;
            }
            else
            {
                budget += a[start];
                current_stay--;
                start++;
            }

            if (current_stay > longest_stay)
            {
                longest_stay = current_stay;
            }

            Console.WriteLine(longest_stay);

            return;
        }
    }
}