Xiao Li raised a group of monkeys, and each monkey had to eat 3 peaches in the morning and 4 peaches in the evening. Once he bought several peaches, and found that if these peaches were for the monkeys to eat for 6 mornings and 5 nights, there would be 7 more peaches; a peach. So how many peaches did Xiao Li buy?
小李养了一群猴子，每只猴子每天早上要吃3个桃子，晚上吃4个桃子．有一次他买了若干个桃子，发现如果这些桃子供猴子吃6个早上、5个晚上，则会多余7个桃子；但如果要供猴子们吃5个早上、6个晚上，则还差8个桃子．那么小李买了多少个桃子．
<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<gadget id="calculator">6 * 1 * 3</gadget>
<output>18</output>

<gadget id="calculator">5 * 1 * 4</gadget>
<output>20</output>

<gadget id="calculator">18 + 20</gadget>
<output>38</output>

<gadget id="calculator">8 + 7</gadget>
<output>15</output>

<gadget id="calculator">1 * 4</gadget>
<output>4</output>

<gadget id="calculator">1 * 3</gadget>
<output>3</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">15 / 1</gadget>
<output>15</output>

<gadget id="calculator">38 * 15</gadget>
<output>570</output>

<gadget id="calculator">570 + 7</gadget>
<output>577</output>

<result>577</result>