[The__]

Add this some where at the top,

pawn Код:

new CBugWarnings[MAX_PLAYERS];

Add this onplayerconnect

pawn Код:

CBugWarnings[playerid] = 0;

This is your keying.

pawn Код:

if ((oldkeys & KEY_FIRE) && (newkeys & KEY_CROUCH)&& GetPlayerWeapon(playerid)==24)
{
    if(CBugWarnings[playerid] >= 5)
    {
        SendClientMessage(playerid, -1, "You've been killed for Cbugging.");
        CBugWarnings[playerid] = 0;
        SetPlayerHealth(playerid,0);
                GameTextForPlayer(playerid, "~r~ C Bug not allowed.", 3000, 1);
        return 1;
    }
    new string[129];
    CBugWarnings[playerid] += 1;
    format(string, sizeof(string), "[WARNING] C-Bugging is not allowed! (%d/5)",CBugWarnings[playerid]);
    SendClientMessage(playerid, -1, string);
}

Something like that. I obviously didn't test it.