[Vince]

Even simpler with the modulus operator:

pawn Код:

if((playerskilled[killerid] % 5) == 0)
{
    SetPlayerWantedLevel(killerid, GetPlayerWantedLevel(killerid)+1);
}

Notice: This can get past level 6 eventually.
It probably won't affect the player, and if it does you can simply make a check for it.