To celebrate Children's Day, Siyuan Experimental School needs to purchase costumes for performances. Each set of children's clothing is 68 yuan, and a discount is offered: buy 3 sets and get 1 set free. If there are 36 people in Class 4 and Class 1, how much will it cost in total?
思源实验学校为庆祝"六一"儿童节，表演节目需要购买服装，儿童服装每套68元，推出优惠：每买3套送1套．如果四1班有36人，一共需要多少钱？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<gadget id="calculator">68 * 27</gadget>
<output>1_836</output>

<result>1_836</result>