Or this initialization function:

int MagicNumber;

//+------------------------------------------------------------------+
//| expert initialization function |
//+------------------------------------------------------------------+
int init()
{
if (Symbol() == "AUDCADm" || Symbol() == "AUDCAD") { MagicNumber = 427101; }
if (Symbol() == "AUDJPYm" || Symbol() == "AUDJPY") { MagicNumber = 427102; }
if (Symbol() == "AUDNZDm" || Symbol() == "AUDNZD") { MagicNumber = 427103; }
if (Symbol() == "AUDUSDm" || Symbol() == "AUDUSD") { MagicNumber = 427104; }
if (Symbol() == "CHFJPYm" || Symbol() == "CHFJPY") { MagicNumber = 427105; }
if (Symbol() == "EURAUDm" || Symbol() == "EURAUD") { MagicNumber = 427106; }
if (Symbol() == "EURCADm" || Symbol() == "EURCAD") { MagicNumber = 427107; }
if (Symbol() == "EURCHFm" || Symbol() == "EURCHF") { MagicNumber = 427108; }
if (Symbol() == "EURGBPm" || Symbol() == "EURGBP") { MagicNumber = 427109; }
if (Symbol() == "EURJPYm" || Symbol() == "EURJPY") { MagicNumber = 427110; }
if (Symbol() == "EURUSDm" || Symbol() == "EURUSD") { MagicNumber = 427111; }
if (Symbol() == "GBPCHFm" || Symbol() == "GBPCHF") { MagicNumber = 427112; }
if (Symbol() == "GBPJPYm" || Symbol() == "GBPJPY") { MagicNumber = 427113; }
if (Symbol() == "GBPUSDm" || Symbol() == "GBPUSD") { MagicNumber = 427114; }
if (Symbol() == "NZDJPYm" || Symbol() == "NZDJPY") { MagicNumber = 427115; }
if (Symbol() == "NZDUSDm" || Symbol() == "NZDUSD") { MagicNumber = 427116; }
if (Symbol() == "USDCHFm" || Symbol() == "USDCHF") { MagicNumber = 427117; }
if (Symbol() == "USDJPYm" || Symbol() == "USDJPY") { MagicNumber = 427118; }
if (Symbol() == "USDCADm" || Symbol() == "USDCAD") { MagicNumber = 427119; }
if (MagicNumber == 0) { MagicNumber = 427199; }

pair = Symbol();

return(0);
}