N,X = map(int,input().split())
A = list(map(int,input().split()))
A = A+A
ans = 0
cur = 0
cnt = 0
for l in range(N):
    for r in range(cur,min(l+N,2*N)):
        cnt += A[r]
        cur = r
        if cnt>X:
            break
    if cnt>X:
        cnt -= A[cur]
        cur -= 1
    ans = max(ans,cnt)
    cur += 1
    cnt -= A[l]
print(ans)