public static void solution ( ) throws IOException {
  int n = Integer . parseInt ( readln ( ) ) ;
  String aa [ ] = readln ( ) . split ( " " ) ;
  int a [ ] = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    a [ i ] = Integer . parseInt ( aa [ i ] ) ;
  }
  Arrays . sort ( a ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( i + 1 == a [ i ] ) {
    }
    else {
      System . out . println ( i + 1 ) ;
      return ;
    }
  }
  System . out . println ( n + 1 ) ;
}

public static void solution ( ) throws IOException { int n = Integer . parseInt ( readln ( ) ) ; String aa [ ] = readln ( ) . split ( " ▁ " ) ; int a [ ] = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { a [ i ] = Integer . parseInt ( aa [ i ] ) ; } Arrays . sort ( a ) ; for ( int i = 0 ; i < n ; i ++ ) { if ( i + 1 == a [ i ] ) { } else { System . out . println ( i + 1 ) ; return ; } } System . out . println ( n + 1 ) ; }
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