public static void main ( String args [ ] ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  ArrayList < Pair > arr = new ArrayList < > ( ) ;
  int max = - 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    Pair p = new Pair ( sc . nextInt ( ) , sc . nextInt ( ) , i ) ;
    arr . add ( p ) ;
    if ( p . r > max ) max = p . r ;
  }
  solve ( arr , n , max ) ;
}

public static void main ( String args [ ] ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; ArrayList < Pair > arr = new ArrayList < > ( ) ; int max = - 1 ; for ( int i = 0 ; i < n ; i ++ ) { Pair p = new Pair ( sc . nextInt ( ) , sc . nextInt ( ) , i ) ; arr . add ( p ) ; if ( p . r > max ) max = p . r ; } solve ( arr , n , max ) ; }
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