raw_input = open('input.txt', 'r').read().splitlines()

input = []

for line in raw_input:
    input.append(list(line))

surrounding_spaces = [
    {'x': -1, 'y': -1},
    {'x': 0, 'y': -1},
    {'x': 1, 'y': -1},
    {'x': -1, 'y': 0},
    {'x': 1, 'y': 0},
    {'x': -1, 'y': 1},
    {'x': 0, 'y': 1},
    {'x': 1, 'y': 1}
]

prev_answer = 0
answer = 0
x_max = len(input[0]) - 1
y_max = len(input) - 1

while True:
    for y, line in enumerate(input):
        for x, char in enumerate(line):
            if char == "@":
                rolls = 0
                for space in surrounding_spaces:
                    current_x = x + space['x']
                    current_y = y + space['y']
                    if current_x < 0 or current_y < 0 or current_x > x_max or current_y > y_max:
                        continue
                    elif input[current_y][current_x] == "@":
                        rolls += 1
                    if rolls > 3:
                        break
                if rolls < 4:
                    answer += 1
                    input[y][x] = "."
    if answer == prev_answer:
        break
    prev_answer = answer

print(answer)