It's a simple example of addition.
The solution is: 2 + 9999 = 10,001
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579 + 9999 = 10578
Using a calculator, which is available on all computers, the answer is easily found to be 10189.
10000 ; This may look to be wrong but you can have 0001 to 9999 which gives you 9999 different combinations of 4 digits, plus another one for 0000.
9999
Exactly as in the question 9999