# encoding: utf-8
#!/usr/bin/env ruby

n = ARGV.first.to_i

$dirs = [:up, :right, :down, :left]
$cur_i = 0
$cur_j = 0
$mat = Array.new(n) { Array.new(n) { ' ' } }

# puts $mat.inspect

def print_matrix
  $mat.each do |line|
    puts line.join
  end
end

def turn(cur_dir)
  idx = ($dirs.index(cur_dir) + 1) % $dirs.length
  $dirs[idx]
end

def move(dir)
  case dir
  when :up
    return $cur_i-1, $cur_j
  when :right
    return $cur_i, $cur_j+1
  when :down
    return $cur_i+1, $cur_j
  when :left
    return $cur_i, $cur_j-1
  else
    return $cur_i, $cur_j
  end
end

def make_line(dir, n)
  n.times do |i|
    $mat[$cur_i][$cur_j] = '*'
    # print_matrix
    $cur_i, $cur_j = move(dir) unless i+1 == n
  end
end

direction = :right
make_line(direction, n)

n.downto(2) do |i|
  direction = turn(direction)
  make_line(direction, i)
end

print_matrix