import sys
input = sys.stdin.readline
from collections import *

n, w = map(int, input().split())
a = [int(input()) for _ in range(n)]
ans = 0
r = 0
now = 0
cnt = defaultdict(int)

for l in range(n):
    while r<n and now+a[r]<=w and cnt[a[r]]==0:
        now += a[r]
        cnt[a[r]] += 1
        r += 1
    
    ans = max(ans, r-l)
    
    if l==r:
        r += 1
    else:
        now -= a[l]
        cnt[a[l]] -= 1

print(ans)