public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  int n , d , m ;
  n = input . nextInt ( ) ;
  d = input . nextInt ( ) ;
  int a [ ] = new int [ n ] ;
  long sum = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    a [ i ] = input . nextInt ( ) ;
  }
  m = input . nextInt ( ) ;
  Arrays . sort ( a ) ;
  if ( m <= n ) {
    for ( int i = 0 ;
    i < m ;
    i ++ ) {
      sum += a [ i ] ;
    }
    System . out . println ( sum ) ;
  }
  else {
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      sum += a [ i ] ;
    }
    sum = sum - ( ( m - n ) * d ) ;
    System . out . println ( sum ) ;
  }
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; int n , d , m ; n = input . nextInt ( ) ; d = input . nextInt ( ) ; int a [ ] = new int [ n ] ; long sum = 0 ; for ( int i = 0 ; i < n ; i ++ ) { a [ i ] = input . nextInt ( ) ; } m = input . nextInt ( ) ; Arrays . sort ( a ) ; if ( m <= n ) { for ( int i = 0 ; i < m ; i ++ ) { sum += a [ i ] ; } System . out . println ( sum ) ; } else { for ( int i = 0 ; i < n ; i ++ ) { sum += a [ i ] ; } sum = sum - ( ( m - n ) * d ) ; System . out . println ( sum ) ; } }
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