def main():
  n,w=map(int,input().split())
  a=[int(input()) for _ in range(n)]
  d={}
  ans=0
  cur=0
  r=0
  for l in range(n):
    while r<n and (a[r] not in d or not d[a[r]]) and cur+a[r]<=w:
      cur+=a[r]
      d[a[r]]=True
      r+=1
    if ans<r-l:
      ans=r-l
    cur-=a[l]
    d[a[l]]=False
  print(ans)
main()