Dennis bought a gift card for 5 and returned to 5 yuan. According to the relevant public information, at present, you can get a discount if you buy a shopping card at Dennis Supermarket for more than 5, yuan at a time, and the discount will be even greater if you return to 5 yuan for every 5, yuan, if it exceeds 3, yuan. To buy a shopping card in the supermarket, you can use cash, bank cards or credit cards. If the denomination of the gift card is below 1 yuan, no real-name registration will be conducted.