#include <amxmodx>
#include <hamsandwich>
new round_num;
public plugin_init() {
    register_event("HLTV", "Event_HLTV", "a", "1=0", "2=0");
    register_event("TextMsg", "Event_Game_Commencing", "a", "2=#Game_Commencing");
    RegisterHam(Ham_Spawn, "player", "Ham_Player_Spawn", 1);
}
public Event_HLTV() {
    round_num++;
    server_print("Раунд = %d.", round_num);
}
public Event_Game_Commencing() {
    round_num = 0;
    server_print("Раунд = 0.");
}
public Ham_Player_Spawn(id) {
    if(round_num >= 3) {
        server_print("Раунд > или = 3.");
    }
}