function Mf()
  while turtle.detect() or turtle.detectUp() do
    turtle.dig()
    turtle.digUp()
  end
  if not turtle.detectDown() then
    turtle.select(2)
    turtle.placeDown()
  end
  turtle.turnLeft()
  if not turtle.detect() then
    turtle.select(2)
    turtle.place()
  end
  turtle.turnRight()
  turtle.turnRight()
  if not turtle.detect() then
    turtle.select(2)
    turtle.place()
  end
  turtle.turnLeft()
  turtle.up()
  if not turtle.detectUp() then
    turtle.select(2)
    turtle.placeUp()
  end
  turtle.turnLeft()
  if not turtle.detect() then
    turtle.select(2)
    turtle.place()
  end
  turtle.turnRight()
  turtle.turnRight()
  if not turtle.detect() then
    turtle.select(2)
    turtle.place()
  end
  turtle.turnLeft()
  turtle.down()
  while turtle.forward() == false do
    turtle.dig()
    turtle.attack()
  end
end

function Mfnum(num)
  for x=0,num,1 do
    Mf()
  end
end

function Coal()
  if turtle.getFuelLevel() < 40 and turtle.getItemCount(1) <1 then
    print "Please put some coal in slot 1"
  end
end

function Refuel()
  if turtle.getFuelLevel() < 80 then
    turtle.refuel()
  end
end

function Spiral(num)
  Mfnum(num)
  turtle.turnRight()
  while num>=3 do
    Coal()
    Refuel()
    Mfnum(num)
    turtle.turnRight()
    Mfnum(num)
    turtle.turnRight()
    num = num - 3
  end
end

print "Length?"
len=tonumber(read())
print "Number of Platforms?"
d=tonumber(read())

for x=0,d,1 do
  Spiral(len)
  turtle.digUp()
  turtle.digDown()
  turtle.down()
  turtle.digDown()
  turtle.down()
  turtle.digDown()
  turtle.down()
end
for y=0,d*3,1 do
  turtle.digUp()
  turtle.up()
end