public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) , m = sc . nextInt ( ) , k = sc . nextInt ( ) ;
  sc . nextLine ( ) ;
  int [ ] diferencias = new int [ n - 1 ] ;
  int anterior = sc . nextInt ( ) ;
  for ( int i = 0 ;
  i < diferencias . length ;
  i ++ ) {
    int actual = sc . nextInt ( ) ;
    diferencias [ i ] = actual - anterior ;
    anterior = actual ;
  }
  sc . nextLine ( ) ;
  Arrays . sort ( diferencias ) ;
  long resultado = k ;
  for ( int i = 0 ;
  i < n - k ;
  i ++ ) resultado += diferencias [ i ] ;
  System . out . println ( resultado ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) , m = sc . nextInt ( ) , k = sc . nextInt ( ) ; sc . nextLine ( ) ; int [ ] diferencias = new int [ n - 1 ] ; int anterior = sc . nextInt ( ) ; for ( int i = 0 ; i < diferencias . length ; i ++ ) { int actual = sc . nextInt ( ) ; diferencias [ i ] = actual - anterior ; anterior = actual ; } sc . nextLine ( ) ; Arrays . sort ( diferencias ) ; long resultado = k ; for ( int i = 0 ; i < n - k ; i ++ ) resultado += diferencias [ i ] ; System . out . println ( resultado ) ; }
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