A specific tiered pricing

[Minh_Ha_NHat]

Hello,

I hope somebody can help me I have tried numerous apps, but I did not find the right one.

What I intend to do: A product cost 39€ if somebody buys a second one, then the second one will cost 30€, if they then a third one (or a fourth, fifth, etc.) it will cost 20€.

I only found apps where you can set up quantity discounts for each products. MAybe somebody knows the right app for me? 

Thanks in advance