Mining turtle variable

--http://pastebin.com/Wh6zKyEC --
--Variable tunnel--
--Program name "Var"--

print("Variable")
print()

--Refuels--
for i=16,1,-1 do
    turtle.select(i)
    turtle.refuel()
end

fuel=turtle.getFuelLevel()


--Asks for dimentions--
print("Width?")
width=read()
print("Height?")
height=read()
print("Distance?")
distance=read()

--Calculates movements that will be carried out--
--Number of moves that will be done--
moves=0
--Takes one movement to turn at the end of a width to get ready for the next--
for p=width,0,-1 do
    moves=moves+1
end

--Takes "height" movement per "width" to break all the blocks--
for k=height,0,-1 do
    moves=moves+(width*1)
end



if (fuel-(fuel%moves))/moves < 2 then
MaxDistance=0
else
MaxDistance=(fuel-(fuel%(moves)))/(moves)
end
print("Starting tunnel with ",fuel," fuel")
print("That equates to a ",MaxDistance, " long tunnel (Of size 3x3)")


for y=width,1,-1 do
    for x=height,1,-1 do
        turtle.dig()
        cangoup=turtle.detectUp()
        turtle.up()
    end
    if cangoup==true then
        turtle.down()
    end
turtle.turnRight()
turtle.forward()
furtle.turnLeft()
end