What is the 100th number in a series of numbers 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, ....
一列数1，2，2，3，3，3，4，4，4，4，…中的第100个数是多少．
<gadget id="calculator">1 + 14</gadget>
<output>15</output>

<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">15 * 7</gadget>
<output>105</output>

<gadget id="calculator">1 + 13</gadget>
<output>14</output>

<gadget id="calculator">13 / 2</gadget>
<output>13/2 = around 6.5</output>

<gadget id="calculator">14 * (13/2)</gadget>
<output>91</output>

<gadget id="calculator">105 - 91</gadget>
<output>14</output>

<result>14</result>