First, 1000 emails go out. At the end of each second, more
emails are sent out as follows:
1. 10,000
(i.e. 
)
2. 100,000
(i.e. 
)
3. 106
4. 107
5. 108
6. 109
7. 1010
8. 1011
9. 1012
10.
1013
11.
1014
12.
1015
13.
1016
14.
1017
15.
1018
16.
1019
17.
1020
18.
1021
19.
1022
20.
1023