#!/usr/bin/env ruby

def turn_left(vector)
  return case vector
  when [1, 0]
    [0, 1]
  when [0, 1]
    [-1, 0]
  when [-1, 0]
    [0, -1]
  when [0, -1]
    [1, 0]
  end
end

def turn_right(vector)
  return case vector
  when [1, 0]
    [0, -1]
  when [0, -1]
    [-1, 0]
  when [-1, 0]
    [0, 1]
  when [0, 1]
    [1, 0]
  end
end

input = $stdin.readlines.map(&:chomp)
size = input.length
infinity = 1000

map = []

infinity.times do
  map << ([false]*((2*infinity)+size))
end

input.each do |r|
  map << ([false]*infinity) + r.chars.map{|x| x == '#'} + ([false]*infinity)
end

infinity.times do
  map << ([false]*((2*infinity)+size))
end

row = infinity + (size + 1)/2 - 1
col = infinity + (size + 1)/2 - 1
dir = [-1, 0]
infections = 0

10_000.times do
  if map[row][col] then
    dir = turn_right(dir)
    map[row][col] = false
  else
    dir = turn_left(dir)
    map[row][col] = true
    infections += 1
  end
  row += dir[0]
  col += dir[1]
end

puts infections