data = open(0).read().strip()

part_2 = False
rows = list(map(str, data.splitlines()))
nrows = len(rows)
ncols = len(rows[0])

for _ in range(100):
    new_field = []
    for r in range(nrows):
        nrow = []
        for c in range(ncols):
            count = 0
            for nb in [(-1, 0), (-1, 1), (0, 1), (1, 1), (1, 0), (1, -1), (0, -1), (-1, -1)]:
                nr = r + nb[0]
                nc = c + nb[1]
                if nr < 0 or nr >= nrows or nc < 0 or nc >= ncols:
                    continue
                if rows[nr][nc] == "#":
                    count += 1
            if rows[r][c] == "#" and (count == 2 or count == 3):
                nrow.append("#")
            elif rows[r][c] == "." and count == 3:
                nrow.append("#")
            else:
                nrow.append(".")
        new_field.append(nrow)
    rows = new_field
    if part_2:
        rows[0][0] = "#"
        rows[0][ncols - 1] = "#"
        rows[nrows - 1][0] = "#"
        rows[nrows - 1][ncols - 1] = "#"

r = 0
for row in rows:
    for c in row:
        if c == "#":
            r += 1
print(r)