int DigitSumm(int number){
   
   int [] MajorDigits = new int[3];
   string strDigit = number.ToString();

    for (int i = 0; i < strDigit.Length;i++)
     {
      int valueFromStr=0;
      try
      {
       valueFromStr = Convert.ToInt16(strDigit.Substring(i,1));
      }
      catch( Exception ex )
      {
       valueFromStr = 0;
       continue;
      }
      int minimalSavedDigitIndex = 0;
      for(int j = 0; j < MajorDigits.Length;j++)
      {
       if(MajorDigits[minimalSavedDigitIndex] > MajorDigits[j])
        minimalSavedDigitIndex = j;
      }
      if(MajorDigits[minimalSavedDigitIndex] < valueFromStr)
       MajorDigits[minimalSavedDigitIndex] = valueFromStr;
     }
   return MajorDigits[0]+MajorDigits[1]+MajorDigits[2];
  }