public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int N = scanner . nextInt ( ) ;
  int M = scanner . nextInt ( ) ;
  int [ ] a = new int [ N ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    a [ i ] = scanner . nextInt ( ) ;
  }
  UnionFind uf = new UnionFind ( N + 1 ) ;
  for ( int i = 0 ;
  i < M ;
  i ++ ) {
    int x = scanner . nextInt ( ) ;
    int y = scanner . nextInt ( ) ;
    uf . union ( x , y ) ;
  }
  int count = 0 ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    if ( uf . find ( i + 1 ) == uf . find ( a [ i ] ) ) count ++ ;
  }
  System . out . println ( count ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int N = scanner . nextInt ( ) ; int M = scanner . nextInt ( ) ; int [ ] a = new int [ N ] ; for ( int i = 0 ; i < N ; i ++ ) { a [ i ] = scanner . nextInt ( ) ; } UnionFind uf = new UnionFind ( N + 1 ) ; for ( int i = 0 ; i < M ; i ++ ) { int x = scanner . nextInt ( ) ; int y = scanner . nextInt ( ) ; uf . union ( x , y ) ; } int count = 0 ; for ( int i = 0 ; i < N ; i ++ ) { if ( uf . find ( i + 1 ) == uf . find ( a [ i ] ) ) count ++ ; } System . out . println ( count ) ; }
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