public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  n = in . nextInt ( ) ;
  m = in . nextInt ( ) ;
  p = new int [ n ] ;
  UF uf = new UF ( n ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) p [ i ] = in . nextInt ( ) ;
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    int x = in . nextInt ( ) - 1 ;
    int y = in . nextInt ( ) - 1 ;
    uf . union ( x , y ) ;
  }
  int cnt = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( uf . same ( i , p [ i ] - 1 ) ) cnt ++ ;
  }
  print ( cnt ) ;
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; n = in . nextInt ( ) ; m = in . nextInt ( ) ; p = new int [ n ] ; UF uf = new UF ( n ) ; for ( int i = 0 ; i < n ; i ++ ) p [ i ] = in . nextInt ( ) ; for ( int i = 0 ; i < m ; i ++ ) { int x = in . nextInt ( ) - 1 ; int y = in . nextInt ( ) - 1 ; uf . union ( x , y ) ; } int cnt = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( uf . same ( i , p [ i ] - 1 ) ) cnt ++ ; } print ( cnt ) ; }
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