A pair of trousers costs 78 yuan, a pair of leather shoes costs twice as much as a pair of trousers, and a jacket costs twice as much as a pair of leather shoes. Dad wants to buy these three things, how much money do he need to prepare?
1条裤子78元，1双皮鞋的价钱是1条裤子的2倍，1件上衣的价钱是1双皮鞋的2倍，爸爸想买这3样东西，需要准备多少钱？
<gadget id="calculator">78 * 2</gadget>
<output>156</output>

<gadget id="calculator">78 * 2 * 2</gadget>
<output>312</output>

<gadget id="calculator">78 + 156 + 312</gadget>
<output>546</output>

<result>546</result>