x = 0
y = 0
z = 0

tx = -402
ty = 200
tz = -193

function fuel()
    if turtle.getFuelLevel() == 0 then
        turtle.select(4)
        turtle.refuel()
    end
end

function up()
    fuel()
    while not turtle.up() do
        turtle.digUp()
        turtle.attackUp()
    end
end

function down()
    fuel()
    while not turtle.down() do
        turtle.digDown()
        turtle.attackDown()
    end
end
function forward()
    fuel()
    while not turtle.forward() do
        turtle.dig()
        turtle.attack()
    end
end

function moveTo(x, y, z)
    dx = 0
    dy = 0
    dz = 0
    dir = 0 -- south

    while dy ~= y do
        if y > dy then
            up()
            dy = dy + 1
        end
        if y < dy then
            down()
            dy = dy - 1
        end
    end

    if dz > z then
        turtle.turnLeft()
        turtle.turnLeft()
        dir = 2
    end

    while dz ~= z do
        turtle.forward()
        if dir == 0 then
            dz = dz + 1
        else
            dz = dz - 1
        end
    end

    if dir == 0 then
        if x > dx then
            turtle.turnLeft()
            dir = 3
        elseif x < dx then
            turtle.turnRight()
            dir = 1
        end
    elseif dir == 2 then
        if x > dx then
            turtle.turnRight()
            dir = 3
        elseif x < dx then
            turtle.turnLeft()
            dir = 1
        end
    end

    while dx ~= x do
        turtle.forward()
        if dir == 3 then
            dx = dx + 1
        else
            dx = dx - 1
        end
    end
end

function nuke()
    turtle.digUp()
    turtle.digDown()
    turtle.select(5)
    turtle.placeUp()
    turtle.select(1)
    turtle.placeDown()
    turtle.select(2)
    turtle.dropDown()
    turtle.select(3)
    turtle.dropDown()
    rs.setOutput("down", true)
    rs.setOutput("up", true)
end

moveTo(tx - x, ty - y, tz - z)
nuke()