#!/usr/bin/env python3
# †
from collections import Counter, deque

###
if __name__ == '__main__':
    N, W = map(int, input().split())
    a = [int(input()) for _ in range(N)]
    deq = deque()
    acc = 0
    cnt = Counter()
    maxi = 0
    size = 0
    for ai in a:
        deq.append(ai)
        acc += ai
        cnt[ai] += 1
        size += 1
        while cnt[ai] > 1 or W < acc:
            top = deq.popleft()
            cnt[top] -= 1
            acc -= top
            size -= 1
        maxi = max(maxi, size)
    print(maxi)