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/**
 *Description:convert Oct to Dec
 *Author:yemoo 2006.12.05
  */

  public   class  P38{
      int  convertOct2Dec(String Oct){
          int  result = 0 ;
          int  power = 1 ;
          for ( int  i = Oct.length() - 1 ;i >= 0 ;i -- ,power *= 8 ){
              char  temp = Oct.charAt(i);
              int  intTemp = Character.getNumericValue(temp);
              if (intTemp >= 0 && intTemp < 8 ){
                 result += intTemp * power;
             } else {
                  if (temp == ' - ' && i == 0 ){
                     result =- result;
                 } else {
                      return  result;
                 }
             }
         }
          return  result;
     }

     String readInput(){
         KeyboardInput in = new  KeyboardInput();
         System.out.print( " Please input a october number: " );
          return  in.readString();
     }

      public   static   void  main(String args[]){
         P38 obj = new  P38();
         String oct = obj.readInput();
          int  value = obj.convertOct2Dec(oct);
         System.out.println( " Oct: " + oct + " ==Dec: " + value);
     }
 }