platform

local dim = read()

turtle.select(1)

local detail = turtle.getItemDetail()

local count = 1

local notEmptyCount = 0

function digBlock()
    if turtle.detect() then
        turtle.dig()
    end
end

function allEmpty()
    isEmpty = false
    for i = 1, 16, 1 do
        turtle.select(i)
        if turtle.getItemDetail() ~= nil then
            if turtle.getItemCount() ~= 0 then
                if turtle.getItemDetail().name == detail.name then
                    notEmptyCount = notEmptyCount + 1
                end
            end
        end
    end
    if notEmptyCount == 0 then
        isEmpty = true
    end
    return isEmpty
end


for j = 0, dim-1, 1 do
    for i = 0, dim-1, 1 do
        digBlock()
        turtle.forward()
        turtle.turnRight()
        turtle.turnRight()
            if turtle.getItemCount() == 0 or turtle.getItemDetail().name ~= detail.name then
                for k = 1, 16, 1 do
                    turtle.select(k)
                    if turtle.getItemDetail() ~= nil then
                        if turtle.getItemDetail().name == detail.name then
                            count = k
                            break
                        end
                    end
                end
            end
        turtle.select(count)
        turtle.place()
        turtle.turnRight()
        turtle.turnRight()
    end
    digBlock()
    if j % 2 == 0 then
        turtle.turnRight()
        digBlock()
        turtle.forward()
        turtle.turnRight()
        digBlock()
        turtle.forward()
    else
        turtle.turnLeft()
        digBlock()
        turtle.forward()
        turtle.turnLeft()
        digBlock()
        turtle.forward()
    end
end