public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int m = sc . nextInt ( ) ;
  boolean flag = true ;
  int [ ] correct = new int [ n ] ;
  int max = Integer . MIN_VALUE ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    correct [ i ] = sc . nextInt ( ) ;
    if ( correct [ i ] > max ) {
      max = correct [ i ] ;
    }
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( correct [ i ] * 2 <= max ) {
      break ;
    }
    if ( i == n - 1 ) {
      flag = false ;
    }
  }
  int min = Integer . MAX_VALUE ;
  if ( flag == false ) {
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      if ( correct [ i ] * 2 > max ) {
        if ( correct [ i ] * 2 < min ) min = correct [ i ] * 2 ;
      }
    }
  }
  if ( flag == false ) {
    max = min ;
    flag = true ;
  }
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    if ( sc . nextInt ( ) <= max ) {
      flag = false ;
      break ;
    }
  }
  sc . close ( ) ;
  ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int m = sc . nextInt ( ) ; boolean flag = true ; int [ ] correct = new int [ n ] ; int max = Integer . MIN_VALUE ; for ( int i = 0 ; i < n ; i ++ ) { correct [ i ] = sc . nextInt ( ) ; if ( correct [ i ] > max ) { max = correct [ i ] ; } } for ( int i = 0 ; i < n ; i ++ ) { if ( correct [ i ] * 2 <= max ) { break ; } if ( i == n - 1 ) { flag = false ; } } int min = Integer . MAX_VALUE ; if ( flag == false ) { for ( int i = 0 ; i < n ; i ++ ) { if ( correct [ i ] * 2 > max ) { if ( correct [ i ] * 2 < min ) min = correct [ i ] * 2 ; } } } if ( flag == false ) { max = min ; flag = true ; } for ( int i = 0 ; i < m ; i ++ ) { if ( sc . nextInt ( ) <= max ) { flag = false ; break ; } } sc . close ( ) ; ; }
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