Divide some candies into several packages on average. There are 10 pieces and 9 pieces in each package, 12 pieces in each package and 11 pieces, and 15 pieces in each package. How many pieces of these candies are there at least?
把一些糖果平均分成若干包，每包10粒余9粒，每包12粒余11粒，每包15粒差1粒，这些糖果最少有多少粒？
<gadget id="calculator">2 * 2 * 3 * 5</gadget>
<output>60</output>

<gadget id="calculator">60 - 1</gadget>
<output>59</output>

<result>59</result>