public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int a = sc . nextInt ( ) ;
  int b = sc . nextInt ( ) ;
  int c = sc . nextInt ( ) ;
  int possible1 = a ;
  int possible2 = b ;
  n = n - 1 ;
  int sum = 0 ;
  for ( int j = n ;
  j >= 1 ;
  j -- ) {
    int min = Math . min ( possible1 , possible2 ) ;
    sum = sum + min ;
    if ( min == a ) {
      possible1 = a ;
      possible2 = c ;
    }
    else if ( min == b ) {
      possible1 = b ;
      possible2 = c ;
    }
    else {
      if ( possible1 == a ) {
        possible1 = b ;
        possible2 = c ;
      }
      else {
        possible1 = a ;
        possible2 = c ;
      }
    }
  }
  System . out . println ( sum ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int a = sc . nextInt ( ) ; int b = sc . nextInt ( ) ; int c = sc . nextInt ( ) ; int possible1 = a ; int possible2 = b ; n = n - 1 ; int sum = 0 ; for ( int j = n ; j >= 1 ; j -- ) { int min = Math . min ( possible1 , possible2 ) ; sum = sum + min ; if ( min == a ) { possible1 = a ; possible2 = c ; } else if ( min == b ) { possible1 = b ; possible2 = c ; } else { if ( possible1 == a ) { possible1 = b ; possible2 = c ; } else { possible1 = a ; possible2 = c ; } } } System . out . println ( sum ) ; }
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