Question about the Party system

[Circa]

If I were to change this part of the code, will it have automatic effect, or do i have to change the client to match with this code?
edit: this is the original code, just wondering if I were to change it.

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1.  
2. //LMA: We set the max number of Party members
3. void CParty::RefreshMax()
4. {
5.     /*Party level : 1~4 -----> Up to 4 players
6.     Party Level : 5~9 -----> Up to 5 players
7.     Party Level : 10~14 -----> Up to 6 players
8.     Party LeveL : Over 15 -----> Up to 7 players*/
9.     int new_one=0;
10. if(PartyLevel>=1&&PartyLevel<=4)
11.     {
12.         new_one=4;
13.     }
14. if(PartyLevel>=5&&PartyLevel<=9)
15.     {
16.         new_one=5;
17.     }
18. if(PartyLevel>=10&&PartyLevel<=14)
19.     {
20.         new_one=6;
21.     }
22. if(PartyLevel>=15)
23.     {
24.         new_one=7;
25.     }
26.  
27.