The students donated money to the disaster-stricken area. The third grade donated 245 yuan, and the fourth grade donated 186 yuan, which was three times less than the third grade. How much less does the third grade donate than the fourth grade?
同学们为灾区小捐款，三年级捐了245元，四年级捐的比三年级的3倍少186元．三年级比四年级少捐多少元？
<gadget id="calculator">245 * 3</gadget>
<output>735</output>

<gadget id="calculator">735 - 186 - 245</gadget>
<output>304</output>

<result>304</result>