The orphanage bought back 15 baskets of apples, each weighing 23 kilograms. If the apples cost 4 yuan per kilogram, how much did it cost to buy these apples?
福利院买回15筐苹果，每筐重23千克，如果每千克苹果4元，买这些苹果一共花多少钱？
<gadget id="calculator">23 * 15 * 4</gadget>
<output>1_380</output>

<result>1_380</result>