Perform the function of a supermarket cashier without using a calculator, which will allow you to improve memory and develop the skills of addition and subtraction in your mind. To begin each level, the cashier needs to have a sufficient number of bags for this level. When the level starts, the shopping panel opens, where the player, if necessary, can buy bags and sweets. The cashier must serve customers, memorizing the prices of goods and putting them in mind, and then inform the amount of the purchase to the client. Having received money for the purchase, he must in his head count the change and give it to the client.To pass to another level, the cashier must serve all clients until their patient tolerance scale is exhausted. The scale can be reset using sweets. If the player incorrectly counted the amount of purchases or delivery, the client will inform the cashier about this, and the client's patience will accelerate. Depending on the speed and accuracy of the cashier's calculations, the level is assigned to the level, and the cashier is credited with money. The game implements the concept of "from simple to complex" and each subsequent level becomes more difficult by speeding up customer patience, adding different fractional product prices, the number of customers and products.