Select last 30 orders in history with magic number 999999 MQL4

Hallo,

I want to select the last 30 orders form my EA with the magicnumber 999999  in MQL4. Currently my code is like this which doesnt account for the MagicNumber:

OrderSelect(OrdersHistoryTotal()-30,SELECT_BY_POS,MODE_HISTORY);  
   double G30 = OrderProfit();                                       if(G30 > 0) W ++;  
   if(G30 == 0) G30 = 0.0001; 
   if(G30 > 0) Wins = Wins + G30; 
   if(G30 < 0) Loss = Loss + G30;
   OrderSelect(OrdersHistoryTotal()-29,SELECT_BY_POS,MODE_HISTORY);  
   double G29 = OrderProfit();                                       if(G29 > 0) W ++; 
   if(G29 == 0) G29 = 0.0001; 
   if(G29 > 0) Wins = Wins + G29; 
   if(G29 < 0) Loss = Loss + G29;               
   OrderSelect(OrdersHistoryTotal()-28,SELECT_BY_POS,MODE_HISTORY);  
   double G28 = OrderProfit();                                       if(G28 > 0) W ++;        
   if(G28 == 0) G28 = 0.0001; 
   if(G28 > 0) Wins = Wins + G28; 
   if(G28 < 0) Loss = Loss + G28;     

 I want to select the last 30 orders from the ea with the magicnumber 999999 and than calculate the average winn and  average loss amount of the last 30 trades.

Can anybody help me?

Kind Regards

Rene