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

if sum(A) <= X:
    print(sum(A))
    exit()
A = A*2
#半開区間を意識する
ans = 0
r = 0
now = 0
for l in range(2*N):
    while r < 2*N and now + A[r] <= X:
        now += A[r]
        r += 1
    ans = max(ans,now)
    now -= A[l]
print(ans)