import sys

available_rolls = 0
file = '4.input' if len(sys.argv) <= 1 else sys.argv[1]
grid = list(map(str.strip, open(file).readlines()))

def check_occupied(y: int, x: int) -> int:
    try:
        return x >= 0 and y >= 0 and grid[y][x] == "@"
    except IndexError:
        return False

for y in range(len(grid)):
    row = grid[y]
    for x in range(len(row)):
        if row[x] != "@": continue
        adj = sum([
            check_occupied(y-1, x-1), check_occupied(y-1, x), check_occupied(y-1, x+1),
            check_occupied(y, x-1), check_occupied(y, x+1),
            check_occupied(y+1, x-1), check_occupied(y+1, x), check_occupied(y+1, x+1)
        ])
        if adj < 4:
            available_rolls += 1

print(f'p1: {available_rolls}')
# print(f'p2: {}')