if(GetPlayerSpecialAction(playerid) == SPECIAL_ACTION_USEJETPACK) //will check if player is using Jetpack
    {
        if(JetPack[playerid] == 0) //if global variable JetPack is 0
        {
                new string[128],name[MAX_PLAYER_NAME];
                GetPlayerName(playerid,name,sizeof(name));
                format(string,sizeof(string),"LG: %s mozebi koristi Jetpack Hack proverete go.",name);
                SendClientMessageToAll(COLOR_GREEN,string);
        }
        else //if global variable JetPack is 1
        return 1; //will return 1;
    }
    else JetPack[playerid] = 0; //if player leaves the JetPack using Enter/F it will set the Global Variable JetPack to 0 again to avoid the problem in our command /jetpack