A certain city holds a mathematics competition. Before the competition, it is stipulated that the top 15 can win prizes. The result of the competition is 1 person for the first place; 2 people for the second place; 3 people for the third place; ...; 15 people for the 15th place. Use the easiest way to calculate how many people have won the prize?
某市举行数学竞赛，比赛前规定，前15名可以获奖，比赛结果第一名1人；第二名并列2人；第三名并列3人；…；第十五名并列15人．用最简便方法计算出得奖的一共有多少人？
<gadget id="calculator">1 + 15</gadget>
<output>16</output>

<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">16 * (15/2)</gadget>
<output>120</output>

<result>120</result>