N, X = map(int, input().split())
A = list(map(int, input().split()))
B = A + A

r = 0
now = 0
ans = 0
for l in range(2 * N):
    while l > r:
        now += B[r]
        r += 1
    while r < 2 * N and now + B[r] <= X:
        now += B[r]
        r += 1
    ans = max(ans, now)
    now -= B[l]

print(ans)