public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int [ ] cals = new int [ 5 ] ;
  for ( int i = 0 ;
  i < 4 ;
  i ++ ) {
    cals [ i + 1 ] = scanner . nextInt ( ) ;
  }
  scanner . nextLine ( ) ;
  String s = scanner . nextLine ( ) ;
  int result = 0 ;
  for ( int i = 0 ;
  i < s . length ( ) ;
  i ++ ) {
    int val = Integer . parseInt ( String . valueOf ( s . charAt ( i ) ) ) ;
    result += cals [ val ] ;
  }
  System . out . println ( result ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int [ ] cals = new int [ 5 ] ; for ( int i = 0 ; i < 4 ; i ++ ) { cals [ i + 1 ] = scanner . nextInt ( ) ; } scanner . nextLine ( ) ; String s = scanner . nextLine ( ) ; int result = 0 ; for ( int i = 0 ; i < s . length ( ) ; i ++ ) { int val = Integer . parseInt ( String . valueOf ( s . charAt ( i ) ) ) ; result += cals [ val ] ; } System . out . println ( result ) ; }
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