In the 10000 numbers from 1 to 10000, what is the sum of all numbers? (Note: It is not the sum of 10000 numbers. For example, the sum of all numbers of the four numbers 8, 9, 10, and 11 is 8+9+1+0+1+1=20.)
在1～10000这10000个数中，所有数码之和是多少．(注意：不是10000个数的和，例如，8，9，10，11这四个数的所有数码之和是8+9+1+0+1+1=20．)
<result>180_001</result>