#!/usr/bin/env ruby
# frozen_string_literal: true

require_relative "grid"

class Main
  def run
    data = []
    $stdin.each_line do |line|
      data << line.chomp
    end

    @sum = 0

    grid = Grid.new(data)
    (0...grid.rows.size).each do |row_index|
      (0...grid.columns.size).each do |column_index|
        cell = grid.cell_at(row_index, column_index)
        next unless cell.value == "@"

        if cell.neighbours.count do |neighbour|
          neighbour.value == "@"
        end < 4
          @sum += 1
        end
      end
    end

    puts @sum
  end
end

Main.new.run