import os

if (os.path.isfile("./input")):
    input = open("./input", "r").read()
else:
    input = "..@@.@@@@.\n@@@.@.@.@@\n@@@@@.@.@@\n@.@@@@..@.\n@@.@@@@.@@\n.@@@@@@@.@\n.@.@.@.@@@\n@.@@@.@@@@\n.@@@@@@@@.\n@.@.@@@.@."

map = input.split('\n')
if (map[-1] == ""):
    map.pop()

for i in range(len(map)):
    map[i] = list("." + map[i] + ".")

map.append(list("." * len(map[0])))
map.insert(0, list("." * len(map[0])))

r = 0
lastr = -1
while (r != lastr):
    lastr = r;
    nmap = map;
    for y in range(len(map)):
        for x in range(len(map[y])):
            if map[y][x] == "@":
                c = 0
                if (map[y+1][x+1] == "@"):
                    c += 1
                if (map[y+1][x] == "@"):
                    c += 1
                if (map[y+1][x-1] == "@"):
                    c += 1
                if (map[y][x+1] == "@"):
                    c += 1
                if (map[y][x-1] == "@"):
                    c += 1
                if (map[y-1][x+1] == "@"):
                    c += 1
                if (map[y-1][x] == "@"):
                    c += 1
                if (map[y-1][x-1] == "@"):
                    c += 1
                if (c < 4):
                    r += 1
                    nmap[y][x] = "."
    map = nmap;

print(r)