public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  N = sc . nextInt ( ) ;
  M = sc . nextInt ( ) ;
  p = new int [ N + 1 ] ;
  sw = new Pair [ M + 1 ] ;
  for ( int i = 1 ;
  i <= N ;
  i ++ ) {
    p [ i ] = sc . nextInt ( ) ;
  }
  for ( int i = 1 ;
  i <= M ;
  i ++ ) {
    sw [ i ] = new Pair ( sc . nextInt ( ) , sc . nextInt ( ) ) ;
  }
  uf = new UnionFind ( N + 1 ) ;
  for ( int i = 1 ;
  i <= M ;
  i ++ ) {
    Pair s = sw [ i ] ;
    uf . unite ( s . x , s . y ) ;
  }
  int sum = 0 ;
  for ( int i = 1 ;
  i <= N ;
  i ++ ) {
    if ( uf . same ( i , p [ i ] ) ) sum ++ ;
  }
  System . out . println ( sum ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; N = sc . nextInt ( ) ; M = sc . nextInt ( ) ; p = new int [ N + 1 ] ; sw = new Pair [ M + 1 ] ; for ( int i = 1 ; i <= N ; i ++ ) { p [ i ] = sc . nextInt ( ) ; } for ( int i = 1 ; i <= M ; i ++ ) { sw [ i ] = new Pair ( sc . nextInt ( ) , sc . nextInt ( ) ) ; } uf = new UnionFind ( N + 1 ) ; for ( int i = 1 ; i <= M ; i ++ ) { Pair s = sw [ i ] ; uf . unite ( s . x , s . y ) ; } int sum = 0 ; for ( int i = 1 ; i <= N ; i ++ ) { if ( uf . same ( i , p [ i ] ) ) sum ++ ; } System . out . println ( sum ) ; }
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