local build = {...}
local l = build[1]
local w = build[2]
local h = build[3]
local L = l-1
local W = w-1
local num = (2*(W*h)+2*(L*h)+2*(l*w))

  function reset()
   turtle.forward()
    for i = 1, h do
     turtle.down()
    end
  end

  function reset1()
   turtle.turnLeft()
   turtle.forward()
   turtle.turnLeft()
   turtle.forward()
   turtle.turnRight()
  end

  function reset2()
   turtle.back()
    while turtle.detectDown() do
     turtle.back()
    end
   turtle.forward()
   turtle.turnLeft()
   turtle.forward()
   turtle.turnRight()
  end

  function reset3()
   turtle.turnRight()
   turtle.forward()
  end

  function reset4()
   turtle.turnLeft()
   for i = 1, W do
    turtle.forward()
   end
   turtle.turnLeft()
   for j = 1, h do
    turtle.up()
   end
   turtle.up()
   turtle.forward()
  end

  function up()
   turtle.up()
   turtle.placeDown()
  end

  function row()
   turtle.placeDown()
   turtle.forward()
  end


-- program starts here
print "this will take"
print (num)
print "blocks type yes when ready or no to terminate"
input = read()

if input== "yes" then


 for i = 1, w do
  for j = 1, l do
   row()
  end

  reset2()
 end

reset3()
turtle.forward()

 for i = 1, W do
  for j = 1, h do
   up()
  end
 reset()
 end
reset1()

 for i = 1, L do
  for j = 1, h do
   up()
  end
 reset()
 end
reset1()

 for i = 1, W do
  for j = 1, h do
   up()
  end
  reset()
 end
reset1()

 for i = 1, L do
  for j = 1, h do
   up()
  end
  reset()
 end

reset4()

  for i = 1, w do
   for j = 1, l do
    row()
   end
   reset2()
  end
end

if input == "no" then shell.exit()
end