In a mathematics competition, less than 50 students participated in the competition. As a result, (1/7) people won the first prize, (1/6) people won the second prize, (1/3) people won the third prize, and the rest Received a commemorative award. How many people received the Memorial Award?
一次数学竞赛，参赛的学生不足50人，结果(1/7)的人获得一等奖，(1/6)的人获得二等奖，(1/3)的人获得三等奖，其余的获得纪念奖．获得纪念奖的是多少人？
<gadget id="calculator">7 * 6</gadget>
<output>42</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/7) + (1/6) + (1/3)</gadget>
<output>9/14 = around 0.642857</output>

<gadget id="calculator">42 * (9/14)</gadget>
<output>27</output>

<gadget id="calculator">42 - 27</gadget>
<output>15</output>

<result>15</result>