Задание 16

#coding: utf-8
n = int(input())
tek = int(input())
k = 1
ans = 0
for i in range(n - 1):
    pred = tek
    tek = int(input())
    if tek == pred:
        k += 1
    else:
        k = 1
    if tek == 0:
        if k > ans:
            ans = k
print(ans)