redstone.setOutput("left", true)

function getGravelCount()
	return turtle.getItemCount(1) + turtle.getItemCount(2) + turtle.getItemCount(3) +
		turtle.getItemCount(4) + turtle.getItemCount(5) + turtle.getItemCount(6) +
			turtle.getItemCount(7) + turtle.getItemCount(8) + turtle.getItemCount(9) +
end

print(getGravelCount())