print("Wie gross soll das Feld sein?")
size = tonumber(read())
if type(size) == "number" then
  print(tostring(size*4+4) .. " Zaeune benoetigt")
  print("Weiter mit beliebiger Taste")
  read()
  for i=1,size+1 do
    turtle.placeDown()
    turtle.forward()
  end
  turtle.turnRight()
  for i=1,size+1 do
    turtle.placeDown()
    turtle.forward()
  end
  turtle.turnRight()
  for i=1,size+1 do
    turtle.placeDown()
    turtle.forward()
  end
  turtle.turnRight()
  for i=1,size+1 do
    turtle.placeDown()
    turtle.forward()
  end
else
  print("Falsches Format!")
end