Xiaogang writes big characters, 1 on the first day, 3 on the second day, 5 on the third day... After that, he writes according to this rule every day. In this way, how many big characters can Xiaogang write in total in 10 days.
小刚写大字，第一天写1个，第二天写3个，第三天写5个…以后每天都按此规律写，这样，小刚10天共写大字多少个．
<gadget id="calculator">1 * 10</gadget>
<output>10</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">10 * 9 * 1</gadget>
<output>90</output>

<gadget id="calculator">10 + 90</gadget>
<output>100</output>

<result>100</result>