Lenovo laptop beeps 3 times no ram in it?

My brother gave me the laptop I should see what kind of ram comes in maybe someone knows? If you want to start it the laptop beeps 3 times. Here again 2 pictures and it is a Lenovo Flex 2-14 model name: 20404

So beeping 3 times means that there's no RAM or defective.

I don't see a slot for the RAM in the picture either

Yes, I think that should be next to the bios battery, right? Then wanted to buy ramm but don't know which one I need

Then search for the model on the Internet. There's ram e.g. Even with low voltage. You have to be careful.