N, X = map(int, input().split())
A = list(map(int, input().split())) * 2

M = S = r = 0
for l in range(N):
  while r < l + N and S + A[r] <= X:
    S += A[r]; r += 1
  M = max(M, S)
  if l == r: r += 1
  else: S -= A[l]

print(M)