How many different ways are there to make up 10 yuan with 1 yuan, 2 yuan and 5 yuan coins?
用1元、2元和5元币凑成10元钱，共有多少种不同的凑法．
<gadget id="calculator">51 + 48 + 46 + 43 + 41 + 38 + 36 + 33 + 31 + 28 + 26 + 23 + 21 + 18 + 16 + 13 + 11 + 8 + 6 + 3 + 1</gadget>
<output>541</output>

<result>541</result>