Among the 4-digit odd numbers with different numbers, how many 4-digit numbers have at least 3 odd numbers?
数字各不相同的四位奇数中，至少有3个奇数的4位数有多少个．
<gadget id="calculator">5 * 4 * 3 * 2</gadget>
<output>120</output>

<gadget id="calculator">4 * 5 * 4 * 3</gadget>
<output>240</output>

<gadget id="calculator">5 * 4 * 3 * 5 * 2</gadget>
<output>600</output>

<gadget id="calculator">120 + 240 + 600</gadget>
<output>960</output>

<result>960</result>