Sporting goods store welcomes Spring Festival promotion. Buy 1-4, 66 yuan each; buy 5-9, 64 yuan each; buy more than 10, 60 yuan each; I bring 320 yuan, how many basketballs can I buy at most?
体育用品商店迎春节促销．买1-4个，每个66元；买5-9个，每个64元；买10个以上，每个60元；我带了320元钱，最多能买多少个篮球？
<gadget id="calculator">320 / 64</gadget>
<output>5</output>

<result>5</result>