function saisieNombre()
        input = read()
        input = tonumber(input)
        while type(input) == "nil" do
                print("Nombre incorrect, recommencez. ")
                input = read()
                input = tonumber(input)
        end
        return input
end

function safeForward()
        succ = turtle.forward()

        while not succ do
                turtle.dig()
                succ = turtle.forward()
        end
	turtle.digUp()
end


turtle.select(1)

print("longueur?")
long = saisieNombre()
print("largeur ? (pair)")
larg = saisieNombre()

nbDepl = (long * larg  + (larg-1) * 3 + 1)
print()

nbDepl = nbDepl + 96
nbFuelNecessaire = turtle.getFuelLevel()- nbDepl

while nbDepl - turtle.getFuelLevel() > 0 do
        remain = nbDepl - turtle.getFuelLevel()
        print("Veuillez placer "..(math.ceil(remain/80)).." coal/charcoal OU "..(math.ceil(remain/1000)).." lava cell dans le premier slot et valider par [entrée]")
        detect = read()
        if turtle.getItemCount(1) > 0 then
                turtle.refuel(turtle.getItemCount(1))
        end

end
nb = 0
while nb ~= larg do
	x = 0
	while x~= long + 1 do
		x = x + 1
		safeForward()
	end
	if nb ~= 0 then
		turtle.turnLeft()
		safeForward()
		safeForward()
		turtle.turnLeft()
		turtle.turnLeft()
		safeForward()
		safeForward()
		safeForward()
		safeForward()
		safeForward()
		turtle.turnRight()
	else
		turtle.turnRight()
		safeForward()
		safeForward()
		safeForward()
		turtle.turnRight()
	end
	nb = nb + 1
	x = 0
	while x~= long + 1 do
		x = x + 1
		safeForward()
	end
	if nb ~= larg - 2 then
		turtle.turnRight()
		safeForward()
		safeForward()
		turtle.turnRight()
		turtle.turnRight()
		safeForward()
		safeForward()
		safeForward()
		safeForward()
		safeForward()
		turtle.turnLeft()
	end
	nb = nb + 1
end