arr = [1, 1, 0, 1, 1, 1, 0, 1]

max_cnt = 0
cnt = 1

for i in range(len(arr) - 1):
    if arr[i] == 1 and arr[i + 1] == 1:
        cnt += 1
    else:
        cnt = 1

    if cnt > max_cnt:
        max_cnt = cnt

print(max_cnt)