public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int [ ] a = new int [ n ] ;
  int r = 0 ;
  while ( r < n ) {
    a [ r ] = sc . nextInt ( ) ;
    r ++ ;
  }
  r = 0 ;
  int i = n - 1 ;
  int q = 1 ;
  Arrays . sort ( a ) ;
  while ( a [ r ] == 0 ) {
    r ++ ;
  }
  r = 0 ;
  while ( a [ r ] == 0 ) {
    if ( r + 1 == n ) {
      q = 0 ;
      r ++ ;
    }
    q = 1 ;
    r ++ ;
  }
  if ( q != 0 ) {
    while ( a [ r ] == 0 ) {
      r ++ ;
    }
    while ( a [ r ] != a [ i ] ) {
      if ( a [ r ] == a [ r + 1 ] ) {
        r ++ ;
      }
      else {
        q ++ ;
        r ++ ;
      }
    }
    System . out . println ( q ) ;
  }
  else {
    System . out . println ( 0 ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int [ ] a = new int [ n ] ; int r = 0 ; while ( r < n ) { a [ r ] = sc . nextInt ( ) ; r ++ ; } r = 0 ; int i = n - 1 ; int q = 1 ; Arrays . sort ( a ) ; while ( a [ r ] == 0 ) { r ++ ; } r = 0 ; while ( a [ r ] == 0 ) { if ( r + 1 == n ) { q = 0 ; r ++ ; } q = 1 ; r ++ ; } if ( q != 0 ) { while ( a [ r ] == 0 ) { r ++ ; } while ( a [ r ] != a [ i ] ) { if ( a [ r ] == a [ r + 1 ] ) { r ++ ; } else { q ++ ; r ++ ; } } System . out . println ( q ) ; } else { System . out . println ( 0 ) ; } }
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