import numpy as np

count = 0

rolls = np.array([])

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))
    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:
                            adj_count += rolls[ni][nj]

                if adj_count < 4:
                    count += 1
                        
print(count)