from collections import defaultdict,deque

n,w=map(int,input().split())
d=defaultdict(int)
ans=0
now=0
q=deque()
for _ in range(n):
    a=int(input())
    now+=a
    q.append(a)
    d[a]+=1
    while (d[a]>1 or now>w) and q:
        out=q.popleft()
        now-=out
        d[out]-=1
    ans=max(ans,len(q))
print(ans)