There is a series of numbers (1/1), (1/2), (2/2), (1/2), (1/3), (2/3), (3/3), (2/3) , (1/3), (1/4), (2/4), (3/4), (4/4), (3/4), (2/4), (1/4), ... Counting from left to right in this string of numbers, what is the number (9/9).
有一串数(1/1)，(1/2)，(2/2)，(1/2)，(1/3)，(2/3)，(3/3)，(2/3)，(1/3)，(1/4)，(2/4)，(3/4)，(4/4)，(3/4)，(2/4)，(1/4)，…这串数字中从左往右数，第多少个是(9/9)．
<gadget id="calculator">9 / 9</gadget>
<output>1</output>

<gadget id="calculator">1 / 1</gadget>
<output>1</output>

<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">3 / 3</gadget>
<output>1</output>

<gadget id="calculator">1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 9</gadget>
<output>73</output>

<result>73</result>