import math

data = open('input', 'r').readlines()
data = [list(x.strip()) for x in data]


def polarToXY(direction, distance):
    if direction % 2 == 1:
        distance *= math.sqrt(2)
    x = distance * math.cos(direction * math.pi / 4)
    y = distance * math.sin(direction * math.pi / 4)
    return [round(x), round(y)]


def getTile(mat, x, y):
    if x < 0 or x >= len(mat):
        raise Exception('oob: x')
    if y < 0 or y >= len(mat[x]):
        raise Exception('oob: y')
    return mat[x][y]


def neighbors(mat, x, y):
    neighbor_list = []
    for direction in range(8):
        try:
            distance = 1
            i, j = polarToXY(direction, distance)
            neighbor = getTile(mat, x + i, y + j)
            while neighbor == '.':
                distance += 1
                i, j = polarToXY(direction, distance)
                neighbor = getTile(mat, x + i, y + j)
            neighbor_list.append(neighbor)
        except:
            pass

    return neighbor_list


def serialize(mat):
    return '\n'.join([''.join(line) for line in mat])


def apply(mat):
    newData = []
    for x, _ in enumerate(mat):
        line = []
        for y, _ in enumerate(mat[x]):
            neigh = list(neighbors(mat, x, y))
            if mat[x][y] == 'L' and '#' not in neigh:
                line.append('#')
            elif mat[x][y] == '#' and neigh.count('#') >= 5:
                line.append('L')
            else:
                line.append(mat[x][y])
        newData.append(line)
    return newData


prev = ''

while serialize(data) != prev:
    prev = serialize(data)
    data = apply(data)

print(prev.count('#'))