<image>As shown in the figure, a festival flower arrangement scheme is designed for a park where one of the flower beds is stacked into a hexagonal pile of flower pots. The top layer consists of one flower pot, and each subsequent layer is arranged in a regular hexagon, with each side increasing by one flower pot per layer. If this pile of flower pots has a total of 8 layers, then the total number of flower pots in the bottom layer is ______________________
 