How many four-digit numbers contain at most one odd number and are divisible by 25?
至多含有一个奇数数字且能被25整除的四位数共有多少个．
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">40 + 25</gadget>
<output>65</output>

<gadget id="calculator">40 + 65</gadget>
<output>105</output>

<result>105</result>