level      xp
----- -------
 0          0
 1       1000
 2       3000
 3       7000
 4      11000
 5      18000
 6      29000
 7      47000
 8      76000
 9     123000
10     200000
11     350000
12     500000
13     650000
14     800000
15     950000
16    1100000
17    1250000
18    1400000
19    1550000
20          +