Arrange the two digits from 9 to 49 in order to form an integer: 910111213141516...4849, what is the sum of the numbers on each digit of this number.
把9～49的两位数依次排列组成一个整数：910111213141516…4849，这个数各位上的数字的和是多少．
<gadget id="calculator">1 + 10</gadget>
<output>11</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">11 * 5</gadget>
<output>55</output>

<gadget id="calculator">55 + 10</gadget>
<output>65</output>

<gadget id="calculator">65 + 10</gadget>
<output>75</output>

<gadget id="calculator">75 + 10</gadget>
<output>85</output>

<gadget id="calculator">55 + 65 + 75 + 85 + 9</gadget>
<output>289</output>

<result>289</result>