n, x = map(int, input().split())
a = list(map(int, input().split()))

ans = 0
a = a  + a
left, right, cur = 0, 0, 0

while left < n:
    while right < n * 2 and cur + a[right] <= x:
        cur += a[right]
        right += 1
    if cur > ans:
        ans = cur
    if right == left:
        left += 1
        right += 1
    else:
        cur -= a[left]
        left += 1

print(ans)