public static void main ( String arg [ ] ) {
  Scanner sc = new Scanner ( System . in ) ;
  String st = sc . nextLine ( ) ;
  int n = sc . nextInt ( ) ;
  int [ ] w = new int [ 26 ] ;
  for ( int i = 0 ;
  i < 26 ;
  i ++ ) {
    w [ i ] = sc . nextInt ( ) ;
  }
  int max = w [ 0 ] ;
  for ( int i = 0 ;
  i < 26 ;
  i ++ ) {
    if ( max < w [ i ] ) max = w [ i ] ;
  }
  int sum = 0 ;
  int i ;
  for ( i = 0 ;
  i < st . length ( ) ;
  i ++ ) {
    sum += ( i + 1 ) * w [ st . charAt ( i ) - 'a' ] ;
  }
  for ( int j = 0 ;
  j < n ;
  j ++ ) {
    sum += ( i + 1 ) * max ;
    i ++ ;
  }
  System . out . println ( sum ) ;
}

public static void main ( String arg [ ] ) { Scanner sc = new Scanner ( System . in ) ; String st = sc . nextLine ( ) ; int n = sc . nextInt ( ) ; int [ ] w = new int [ 26 ] ; for ( int i = 0 ; i < 26 ; i ++ ) { w [ i ] = sc . nextInt ( ) ; } int max = w [ 0 ] ; for ( int i = 0 ; i < 26 ; i ++ ) { if ( max < w [ i ] ) max = w [ i ] ; } int sum = 0 ; int i ; for ( i = 0 ; i < st . length ( ) ; i ++ ) { sum += ( i + 1 ) * w [ st . charAt ( i ) - ' a ' ] ; } for ( int j = 0 ; j < n ; j ++ ) { sum += ( i + 1 ) * max ; i ++ ; } System . out . println ( sum ) ; }
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