In a box of ping-pong balls, there are 2 ping-pong balls for 3 and 3 points, and 3 for 5 and 5 points. At least how many ping-pong balls are there in this box of ping-pong balls?
一盒乒乓球，3个3个的分剩2个，5个5个分少3个，这盒乒乓球至少有多少个乒乓球？
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">15 + 2</gadget>
<output>17</output>

<result>17</result>