import numpy as np

count = 0

rolls = np.array([])

#
# I would like to thoroughly apologize for this monstrosity.
# I impore you, do not let this define your opinion of me.
# But I will understand if it does.
# Thank you for your attention in this matter.
#

with open('input.txt', 'r') as file:
    cols_num = len(file.readline().strip())
    file.seek(0)
    lines_num = 0
    for line in file:
        for char in line.strip():
            if char == '@':
                rolls = np.append(rolls, 1)
            else:
                rolls = np.append(rolls, 0)
        lines_num += 1
    
    rolls = rolls.reshape((lines_num, cols_num))
    pass_count = -1
    while pass_count != 0:
        pass_count = 0
        for i in range(lines_num):
            for j in range(cols_num):
                if rolls[i][j] == 1:
                    adj_count = 0
                    for di in [-1, 0, 1]:
                        for dj in [-1, 0, 1]:
                            if di == 0 and dj == 0:
                                continue
                            ni, nj = i + di, j + dj
                            if 0 <= ni < lines_num and 0 <= nj < cols_num:
                                if rolls[ni][nj] != 0:
                                    adj_count += 1

                    if adj_count < 4:
                        count += 1
                        pass_count += 1
                        rolls[i][j] = 2
        
        for i in range(lines_num):
            for j in range(cols_num):
                if rolls[i][j] == 2:
                    rolls[i][j] = 0
                        
print(count)