how much is it for size 5?

Sure, according to my search results the Nike Air Force 1 Gs in size 5 is available for R1799 from various retailers. The Air Force 1 is a classic sneaker style from Nike that is very popular. For the price of R1799, you would be getting a versatile pair of shoes that you can wear with many different outfits. Please let me know if you need any other details!