public static void main ( String [ ] args ) {
  int a , b , n ;
  int minCapacity = 0 ;
  int du = 0 ;
  int peopleAtStop = 0 ;
  Scanner sc = new Scanner ( System . in ) ;
  n = sc . nextInt ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    a = sc . nextInt ( ) ;
    b = sc . nextInt ( ) ;
    peopleAtStop = b - a + du ;
    du = peopleAtStop ;
    if ( peopleAtStop > minCapacity ) {
      minCapacity = peopleAtStop ;
    }
  }
  System . out . println ( minCapacity ) ;
}

public static void main ( String [ ] args ) { int a , b , n ; int minCapacity = 0 ; int du = 0 ; int peopleAtStop = 0 ; Scanner sc = new Scanner ( System . in ) ; n = sc . nextInt ( ) ; for ( int i = 0 ; i < n ; i ++ ) { a = sc . nextInt ( ) ; b = sc . nextInt ( ) ; peopleAtStop = b - a + du ; du = peopleAtStop ; if ( peopleAtStop > minCapacity ) { minCapacity = peopleAtStop ; } } System . out . println ( minCapacity ) ; }
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