n,w=map(int,input().split())
a=[int(input()) for _ in range(n)]
cnt={}
for v in a:
    cnt[v]=0
t=0
ans=0
sw=0
for s in range(n):
    while t<n and sw+a[t]<=w and cnt[a[t]]<=0:
        sw+=a[t]
        cnt[a[t]]+=1
        t+=1
    ans=max(ans,t-s)
    sw-=a[s]
    cnt[a[s]]-=1
print(ans)