Xiaojun and Xiaolan have a rope skipping competition. Each jumps 3 times. Xiaojun averages 115 times each time. Xiaolan's average score in the first two times is 112. If Xiaolan wants to win, she must jump at least the third time. How many times?
小军和小兰进行跳绳比赛，每人各跳3次，小军平均每次跳115下，小兰前两次的平均成绩是112下，小兰要想获胜，第三次她最少要跳多少下？
<gadget id="calculator">115 * 3</gadget>
<output>345</output>

<gadget id="calculator">112 * 2</gadget>
<output>224</output>

<gadget id="calculator">345 - 224</gadget>
<output>121</output>

<result>121</result>