There are 128 students in the fifth grade and 103 students in the sixth grade in Dongjiang Primary School. The school needs to buy a copy of "Mathematics Guide by Famous Teachers" for 15 yuan for each student in the fifth and sixth grades. How much does it cost in total?
东江小学五年级有128人，六年级有103人，学校要为五、六年级的每个同学购买一本价格为15元的《名师数学指导》，一共需要多少钱？
<gadget id="calculator">128 + 103</gadget>
<output>231</output>

<gadget id="calculator">231 * 15</gadget>
<output>3_465</output>

<result>3_465</result>