Xiaohong's summer vacation life is very regular. Every four days, she goes to the Children's Palace on the first day, the swimming pool on the next two days, and the library on the last day. If you follow this routine from July 1, how many days in July will Xiaohong go to the Children's Palace for the fourth time?
小红的暑假生活很有规律，每四天中第一天去少年宫，接着两天去游泳馆，最后一天去图书馆．如果从7月1日起照此规律活动，小红第4次去少年宫是7月多少日．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<result>13</result>