5th period teacher!!!

1. Japan
2. England
3. Italy
4. Liechtenstein
5. Netherlands
6. Finland
7. Norway
8. Australia
9. Sealand
10. Belgium
11. Hungary
12. Belarus
13. America
14. Northern Ireland
15. Prussia
16. Russia
17. Iceland
18. Greece
19. Turkey
20. Germany
21. Sweden
22. Denmark
23. China
24. Canada
25. Austria
26. Holy Roman Empire
27. France
28. Romano
29. Latvia
30. Estonia
31. Poland
32. Ladonia
33. Lithuania
34. Ukraine
35. Switzerland
36. Egypt
37. Other

I feel like I'm missing some important ones.....

Anyway, now choose between 1-30.