import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N, W = getlist()
	A = []
	D = defaultdict(int)
	for i in range(N):
		a = int(input())
		A.append(a)

	i = 0; j = 0
	val = 0
	ans = 0
	jud = 0
	while True:
		if val > W or jud == 1:
			if i >= N:
				break
			D[A[i]] -= 1; val -= A[i]
			if D[A[i]] == 1:
				jud = 0
			i += 1
		else:
			if j >= N:
				break
			D[A[j]] += 1; val += A[j]
			if D[A[j]] == 2:
				jud = 1
			else:
				if val <= W:
					ans = max(ans, j - i + 1)

			j += 1

	print(ans)

if __name__ == '__main__':
	main()