How many simple fractions have the denominator less than 60 and the numerator not less than 6?
分母小于60，分子不小于6的最简真分数有多少个．
<gadget id="calculator">59 - 30</gadget>
<output>29</output>

<gadget id="calculator">59 - 21</gadget>
<output>38</output>

<gadget id="calculator">59 - 15</gadget>
<output>44</output>

<gadget id="calculator">59 - 31</gadget>
<output>28</output>

<gadget id="calculator">58 + 29 + 38 + 44 + 28 + 20</gadget>
<output>217</output>

<result>217</result>