The number "1" in the natural number "1" appears once, the number "1" in the natural number "51" appears once; the number "1" in the natural number "121" appears twice...then the number "1" appears in 1 to 300 how many times.
自然数"1"中数字"1"出现了一次，自然数"51"中数字"1"出现了一次；自然数"121"中数字"1"出现了两次…那么1到300中数字"1"出现了多少次．
<gadget id="calculator">30 + 30 + 100</gadget>
<output>160</output>

<result>160</result>