double LotByRisk(string pair)
  {
   if(InpRisk <= 0)
      return(Lot);
   double Free    = AccountInfoDouble(ACCOUNT_MARGIN_FREE);
   double LotVal  = SymbolInfoDouble(pair,SYMBOL_TRADE_TICK_VALUE);
   double Min_Lot = SymbolInfoDouble(pair,SYMBOL_VOLUME_MIN);
   double Max_Lot = SymbolInfoDouble(pair,SYMBOL_VOLUME_MAX);
   double Step1   = SymbolInfoDouble(pair,SYMBOL_VOLUME_STEP);
   double slpss=stopLoss;
   if(slpss<=0)
      slpss=1000;
   if(LotVal<=0)
      LotVal=1;

   double max_risk = InpRisk;

   double Lotss=MathFloor((Free*max_risk/100)/(slpss*LotVal)/Step1)*Step1;

   Lotss = NormalizeDouble(Lotss,LotDigitsPair);

   if(Lotss<Min_Lot)
      Lotss=Min_Lot;
   if(Lotss>Max_Lot)
      Lotss=Max_Lot;

   return(Lotss);
  }

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