N, X = map(int, input().split())
A = list(map(int, input().split()))
if sum(A) <= X:
	exit(print(sum(A)))
r = 0
now = 0
ans = 0
for l in range(N):
	while now <= X:
		now += A[r]
		r = (r + 1) % N
	r = (r - 1) % N
	now -= A[r]
	ans = max(ans, now)
	now -= A[l]
print(ans)