N, X = map(int, input().split())
A = list(map(int, input().split()))
A += A
j = 0
ans = 0
tmp = 0
for i in range(N):
    while j < i + N and tmp + A[j] <= X:
        tmp += A[j]
        j += 1
    ans = max(ans, tmp)
    tmp -= A[i]
print(ans)