The children of Guangming Primary School donated 256 yuan to Hope Primary School, 256 yuan to the 4th grade, 372 yuan to the 5th grade, and 328 yuan to the 6th grade. How much did the three grades donate in total?
光明小学的孩子们给希望小学捐款，四年级捐了256元，五年级捐了372元，六年级捐了328元．这三个年级一共捐了多少元？
<gadget id="calculator">256 + 372 + 328</gadget>
<output>956</output>

<result>956</result>