public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int n = Integer . parseInt ( scanner . nextLine ( ) ) ;
  String [ ] line = scanner . nextLine ( ) . split ( " " , 2 ) ;
  int a = Integer . parseInt ( line [ 0 ] ) ;
  int b = Integer . parseInt ( line [ 1 ] ) ;
  boolean [ ] passed = new boolean [ n ] ;
  passed [ a - 1 ] = true ;
  passed [ b - 1 ] = true ;
  int k = Integer . parseInt ( scanner . nextLine ( ) ) ;
  line = scanner . nextLine ( ) . split ( " " , k ) ;
  boolean yes = true ;
  for ( int i = 0 ;
  i < k ;
  i ++ ) {
    int p = Integer . parseInt ( line [ i ] ) ;
    if ( passed [ p - 1 ] ) {
      yes = false ;
      break ;
    }
    passed [ p - 1 ] = true ;
  }
  if ( yes ) {
    System . out . println ( "YES" ) ;
  }
  else {
    System . out . println ( "NO" ) ;
  }
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int n = Integer . parseInt ( scanner . nextLine ( ) ) ; String [ ] line = scanner . nextLine ( ) . split ( " ▁ " , 2 ) ; int a = Integer . parseInt ( line [ 0 ] ) ; int b = Integer . parseInt ( line [ 1 ] ) ; boolean [ ] passed = new boolean [ n ] ; passed [ a - 1 ] = true ; passed [ b - 1 ] = true ; int k = Integer . parseInt ( scanner . nextLine ( ) ) ; line = scanner . nextLine ( ) . split ( " ▁ " , k ) ; boolean yes = true ; for ( int i = 0 ; i < k ; i ++ ) { int p = Integer . parseInt ( line [ i ] ) ; if ( passed [ p - 1 ] ) { yes = false ; break ; } passed [ p - 1 ] = true ; } if ( yes ) { System . out . println ( " YES " ) ; } else { System . out . println ( " NO " ) ; } }
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