function Fuel()
    if turtle.getFuelLevel() == 0 then
        turtle.refuel(1)
    end
end

function Forward()
    Fuel()
    for i=1,5 do
        if turtle.detect() then
            turtle.dig()
        end
    end
    return turtle.forward()
end

function FForward()
	while Forward() == false do
	end
end

function FBack()
	Fuel()
	if turtle.back() == false then
		turtle.turnLeft()
		turtle.turnLeft()
		FForward()
		turtle.turnLeft()
		turtle.turnLeft()
	end
end

function Up()
    Fuel()
    for i=1,5 do
        if turtle.detectUp() then
            turtle.digUp()
        end
    end
    return turtle.up()
end

function FUp()
	while Up() == false do
	end
end


function Down()
    Fuel()
    for i=1,5 do
        if turtle.detectDown() then
            turtle.digDown()
        end
    end
    return turtle.down()
end

function FDown()
	while Down() == false do
	end
end

function InfUp()
    local x = 0
    while (turtle.detectUp()) and (Up()) do
        x = x+1
    end
    for i=1,x do
        FDown()
    end
end

function InfDown()
    local x = 0
    while Down() do
        x = x+1
    end
    for i=1,x do
        FUp()
    end
end

function CleanInventory()
    for i=2,16 do
        turtle.select(i)
        turtle.drop(64)
    end
    turtle.select(1)
end

function Refuel()
    turtle.suck(64)
	for i=2,16 do
		if turtle.getItemCount(i) > 0 then
			data = turtle.getItemDetail(i)
			if (data.name == 'minecraft:coal') then
				turtle.select(i)
				turtle.drop(64)
				turtle.select(1)
			end
		end
	end
end

function ThrowAway()
	for i=2,16 do
		if turtle.getItemCount(i) > 0 then
			data = turtle.getItemDetail(i)
			if isBlackListed(data) then
				turtle.select(i)
				turtle.dropDown(64)
			end
		end
	end
	turtle.select(1)
end


function isBlackListed(data)
	if data.name == 'minecraft:stone' then
		return true
	end
	if data.name == 'minecraft:cobblestone' then
		return true
	end
	if data.name == 'minecraft:dirt' then
		return true
	end
	if data.name == 'minecraft:grass' then
		return true
	end
	if data.name == 'minecraft:sand' then
		return true
	end
	if data.name == 'minecraft:gravel' then
		return true
	end
	if data.name == 'minecraft:bedrock' then
		return true
	end
	if data.name == 'minecraft:water' then
		return true
	end
	if data.name == 'minecraft:flowing_water' then
		return true
	end
	if data.name == 'minecraft:lava' then
		return true
	end
	if data.name == 'minecraft:flowing_lava' then
		return true
	end
	if data.name == 'chisel:limestone2' then
		return true
	end
	if data.name == 'chisel:marble2' then
		return true
	end
	if data.name == 'buildcraftenergy:fluid_block_oil_heat_0' then
		return true
	end

	return false
end

MAXDEPTH = 50

function filon(depth)
	if depth >= MAXDEPTH then
		return true
	end
	local success,data = turtle.inspectUp()
	if success and (isBlackListed(data) == false) then
		FUp()
		filon(depth+1)
		FDown()
	end
	success,data = turtle.inspectDown()
	if success and (isBlackListed(data) == false) then
		FDown()
		filon(depth+1)
		FUp()
	end
	for i=1,4 do
		success,data = turtle.inspect()
		if success and (isBlackListed(data) == false) then
			FForward()
			filon(depth+1)
			FBack()
		end
		turtle.turnRight()
	end
end

function goBack(X,Y,Z)
	for i=1,Z do
		FUp()
	end
	for i=1,Y do
		FBack()
	end
	turtle.turnLeft()
	for i=1,X do
		FBack()
	end
end

function goForward(X,Y,Z)
	for i=1,X do
		FForward()
	end
	turtle.turnRight()
	for i=1,Y do
		FForward()
	end
	for i=1,Z do
		FDown()
	end
end

function verFilon()
	local z = 0
    while Down() do
        z = z+1
		ThrowAway()
		filon(0)

    end
    for i=1,z do
        FUp()
    end
end


wid,iX,iY = ...

wid = tonumber(wid)
iX = tonumber(iX)
iY = tonumber(iY)

while (iX < wid) or (iY < wid) do
	x = 4*iX+2
	y = 4*iY+2
	goForward(x,y,0)
	Z=0
	while Down() do
		Z = Z+1
		if (Z%4 == 0) then
			ThrowAway()
		end
		filon(0)
		if turtle.getItemCount(16) > 0 then
			goBack(x,y,Z)
			turtle.turnLeft()
			Refuel()
			turtle.turnLeft()
			CleanInventory()
			turtle.turnLeft()
			turtle.turnLeft()
			goForward(x,y,Z)
		end
	end
	goBack(x,y,Z)
	turtle.turnLeft()
	Refuel()
	turtle.turnLeft()
	CleanInventory()
	turtle.turnLeft()
	turtle.turnLeft()


	iY = iY +1
	if iY >= wid then
		iX = iX +1
		iY = 0
	end
end