public static void main ( String [ ] args ) {
  int n ;
  Scanner reader = new Scanner ( System . in ) ;
  n = reader . nextInt ( ) ;
  int [ ] a = new int [ n ] ;
  int days , max = 0 , i ;
  for ( i = 0 ;
  i < n ;
  ++ i ) {
    a [ i ] = reader . nextInt ( ) ;
  }
  for ( i = days = 0 ;
  i < n ;
  ++ i ) {
    if ( max < a [ i ] ) max = a [ i ] ;
    if ( max == i + 1 ) ++ days ;
  }
  System . out . println ( days ) ;
}

public static void main ( String [ ] args ) { int n ; Scanner reader = new Scanner ( System . in ) ; n = reader . nextInt ( ) ; int [ ] a = new int [ n ] ; int days , max = 0 , i ; for ( i = 0 ; i < n ; ++ i ) { a [ i ] = reader . nextInt ( ) ; } for ( i = days = 0 ; i < n ; ++ i ) { if ( max < a [ i ] ) max = a [ i ] ; if ( max == i + 1 ) ++ days ; } System . out . println ( days ) ; }
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