Koizumi and Ou Ou each have a certain amount of candy, and they bet on climbing the pole. Once Koizumi climbs to the top, Ouou will give Koizumi 8 candies. If Koizumi can't climb up, Koizumi will give Ouou 5 candies. Koizumi climbed 18 times in total, but Koizumi climbed 25 times less than at the beginning. How many times has Koizumi climbed to the top?
小泉和欧欧各有若干糖果，他们打赌爬杆．小泉爬上顶端一次，欧欧就给小泉8个糖果，要是小泉爬不上去，小泉就要给欧欧5个糖果．小泉一共爬了18次，结果小泉反而比最开始少了25个．小泉爬上顶端有多少次？
<gadget id="calculator">18 * 5</gadget>
<output>90</output>

<gadget id="calculator">90 - 25</gadget>
<output>65</output>

<gadget id="calculator">5 + 8</gadget>
<output>13</output>

<gadget id="calculator">65 / 13</gadget>
<output>5</output>

<result>5</result>