startup.lua

cobblestone = "minecraft:cobblestone"
gravel = "minecraft:gravel"
dirt = "minecraft:dirt"
turtlename = "computercraft:turtle_expanded"

function forward(count)
    for i = 1, count do
        while not turtle.forward() do
            success, data = turtle.inspect()
            if success then
                if data.name == turtlename then
                    os.sleep(5)
                else
                    turtle.dig()
                end
            end
        end
    end
end

num = read()
forward(num)