The school gymnasium has to distribute basketballs to 9 classes. Now it is known that each class distributes 5 basketballs, and the remaining number is not enough to distribute. What is the maximum number of basketballs in the gymnasium?
学校体育馆要给9个班发篮球，现在已知每个班发5个，剩下的只数不够发了，体育馆最多有多少个篮球．
<gadget id="calculator">5 * 9</gadget>
<output>45</output>

<gadget id="calculator">45 + 8</gadget>
<output>53</output>

<result>53</result>