There are 306 red balloons in the store, 90 more yellow balloons than red balloons, and 74 more blue balloons than yellow balloons. How many blue balloons are there in the store?
商店里有红气球306个，黄气球比红气球多90个，蓝气球比黄气球多74个．商店里有蓝气球多少个？
<gadget id="calculator">306 + 90 + 74</gadget>
<output>470</output>

<result>470</result>