public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  char inp [ ] = sc . next ( ) . toCharArray ( ) ;
  int k = sc . nextInt ( ) ;
  int max = 0 ;
  int num [ ] = new int [ 26 ] ;
  for ( int i = 0 ;
  i < num . length ;
  i ++ ) {
    num [ i ] = sc . nextInt ( ) ;
    if ( i == 0 ) {
      max = num [ i ] ;
    }
    else {
      if ( max < num [ i ] ) {
        max = num [ i ] ;
      }
    }
  }
  int ans = 0 ;
  for ( int i = 0 ;
  i < inp . length ;
  i ++ ) {
    ans += num [ inp [ i ] - 'a' ] * ( i + 1 ) ;
  }
  for ( int i = 1 ;
  i <= k ;
  i ++ ) {
    ans += max * ( inp . length + i ) ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; char inp [ ] = sc . next ( ) . toCharArray ( ) ; int k = sc . nextInt ( ) ; int max = 0 ; int num [ ] = new int [ 26 ] ; for ( int i = 0 ; i < num . length ; i ++ ) { num [ i ] = sc . nextInt ( ) ; if ( i == 0 ) { max = num [ i ] ; } else { if ( max < num [ i ] ) { max = num [ i ] ; } } } int ans = 0 ; for ( int i = 0 ; i < inp . length ; i ++ ) { ans += num [ inp [ i ] - ' a ' ] * ( i + 1 ) ; } for ( int i = 1 ; i <= k ; i ++ ) { ans += max * ( inp . length + i ) ; } System . out . println ( ans ) ; }
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