Xiao Li sells cabbage. He stipulates that the top 10 people buy 5 catties and get 1 catty for free every day, the top 25 buy 10 catties and get 1 catty for free, and the rest buy 20 catties and get 1 catty for free. Jin, just sold out, at least how many catties of cabbage does Xiao Li have today?
小李卖白菜规定每日前10名买5斤送1斤，前25名买10斤送1斤，其余买20斤送1斤，如果某日小李的当铺有40名顾客，都送了1斤，正好卖完，这天小李至少有多少斤白菜？
<gadget id="calculator">40 - 10 - 25</gadget>
<output>5</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">50 + 10</gadget>
<output>60</output>

<gadget id="calculator">25 * 10</gadget>
<output>250</output>

<gadget id="calculator">250 + 25</gadget>
<output>275</output>

<gadget id="calculator">5 * 20</gadget>
<output>100</output>

<gadget id="calculator">100 + 5</gadget>
<output>105</output>

<gadget id="calculator">60 + 275 + 105</gadget>
<output>440</output>

<result>440</result>