function Mf()
  while turtle.detect() or turtle.detectUp() do
    turtle.dig()
    turtle.digUp()
  end
  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.digDown()
  turtle.down()
  turtle.digDown()
  turtle.down()
  turtle.digDown()
  turtle.down()
end