function grab()
        turtle.dig()
        os.sleep(0.5)
        while turtle.detect()==true do
                turtle.dig()
                os.sleep(0.5)
        end
        turtle.forward()
        turtle.digUp()
        os.sleep(0.5)
        while turtle.detectUp()==true do
                turtle.digUp()
                os.sleep(0.5)
        end
        turtle.digDown()
end

torch=turtle.getItemCount(16)
for j=1,torch do
        for i=1,3 do
                grab()
                if i == 2 then
                        turtle.select(16)
                        turtle.placeDown()
                end
        end
        turtle.turnRight()
        for i=1,5 do
                grab()
        end
        turtle.turnLeft()
        turtle.turnLeft()
        for i=1,5 do
                turtle.forward()
        end
        for i=1,5 do
                grab()
        end
        turtle.turnLeft()
        turtle.turnLeft()
        for i=1,5 do
                turtle.forward()
        end
        turtle.turnLeft()
        if turtle.getItemCount(15) > 20 then
                turtle.turnLeft()
                turtle.turnLeft()
                for i=1,(torch-turtle.getItemCount(16))*3 do
                        turtle.forward()
                end
                for i=1,15 do
                        turtle.select(i)
                        turtle.drop()
                end
                turtle.turnLeft()
                turtle.turnLeft()
                for i=1,(torch-turtle.getItemCount(16))*3 do
                        turtle.forward()
                end
        end
end

turtle.turnLeft()
turtle.turnLeft()
for i=1,torch*3 do
        turtle.forward()
end