import collections

N,W = map(int, input().split())
A = []
for _ in range(N):
    A.append(int(input()))
D = collections.defaultdict(int)
ans = 0
j = 0
s = 0
for i in range(N+1):
    while j<N and s<=W and D[A[j]]==0:
        D[A[j]]=1
        s+=A[j]
        if s<=W:
            ans = max(ans,j-i+1)
        j += 1
    if i==N:
        break
    s -= A[i]
    D[A[i]]=0

if ans<=1:
    print(0)
else:
    print(ans)