Get Total Inventory of Turtle

function getInv() --Returns total inventory of the turtle
        local c = 1
    local total = 0
        while( c < 17) do
        total = total + turtle.getItemCount(c)
                c = c + 1
        end
    return total
end

mon = peripheral.wrap("left")
mon.clear()

while(1) do
    mon.setCursorPos(1,1)
    mon.write(getInv())
    sleep(1)
    mon.clear()
end