The students went to the amusement park, 36 people played the merry-go-round, 28 people played the bumper car, and 15 people played both sports. How many people went to the amusement park?
同学们去游乐园游玩，玩旋转木马的有36人，玩碰碰车的有28人，两个项目都玩的有15人．去游乐园的一共有多少人？
<gadget id="calculator">28 - 15</gadget>
<output>13</output>

<gadget id="calculator">36 + 13</gadget>
<output>49</output>

<result>49</result>