So theoretically

Continent1
1-2-3
3-4-5
5-6-7
7-8-9
9-10-11
11-12-13

13-14-15
Continent 2
15-16-17
17-18-19
19-20-21
21-22-23

23-24-25
Continent 3
25-26-27
27-28-29
29-30-31
31-32-33

33-34-35
Continent 4
35-36-37
37-38-39
39-40-41
41-42-43

43 Total countries on one ticket???