import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int w = sc.nextInt();
        int[] arr = new int[n];
        for (int i = 0; i < n; i++) {
            arr[i] = sc.nextInt();
        }
        HashSet<Integer> set = new HashSet<>();
        int left = 0;
        int right = -1;
        int sum = 0;
        int max = 0;
        while (right < n - 1) {
            while (right < n - 1 && !set.contains(arr[right + 1]) && sum + arr[right + 1] <= w) {
                right++;
                set.add(arr[right]);
                sum += arr[right];
            }
            max = Math.max(max, right - left + 1);
            set.remove(arr[left]);
            sum -= arr[left];
            left++;
            if (left > right) {
                right = left - 1;
                sum = 0;
            }
        }
        System.out.println(max);
    }
}