field = []
for _ in range(10):
    row = list(map(int, input().split()))
    field.append(row)

def find_max_width(field):
    max_ship_width = 1

    for row in field:
        row_as_string = ''.join(map(str, row))
        for width in range(1, 11):
            ship_as_string = ''.join(['0' for _ in range(width)])
            if row_as_string.find(ship_as_string) != -1:
                max_ship_width = max(max_ship_width, width)

    return max_ship_width

max_width = find_max_width(field)
field = zip(*field[::-1])
max_height = find_max_width(field)

print(max(max_width, max_height))