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

ans = 0
cnt = 0
right = 0
for left in range(N*2):
    while right < N*2 and cnt+A[right] <= X and right-left < N:
        cnt += A[right]
        right += 1
    ans = max(ans, cnt)
    if left == right:
        right += 1
        continue
    cnt -= A[left]

print(ans)