public static void solve ( ) {
  int n = sc . nextInt ( ) ;
  int [ ] a = new int [ n + 1 ] ;
  int [ ] b = new int [ n + 1 ] ;
  int [ ] extra = new int [ n + 1 ] ;
  long curr_time = 0 ;
  for ( int i = 1 ;
  i <= n ;
  i ++ ) {
    a [ i ] = sc . nextInt ( ) ;
    b [ i ] = sc . nextInt ( ) ;
  }
  for ( int i = 1 ;
  i <= n ;
  i ++ ) {
    extra [ i ] = sc . nextInt ( ) ;
  }
  int i = 0 ;
  for ( i = 1 ;
  i < n ;
  i ++ ) {
    curr_time += ( a [ i ] - b [ i - 1 ] + extra [ i ] ) ;
    int staying = ( int ) Math . ceil ( ( b [ i ] - a [ i ] ) / 2.0 ) ;
    curr_time += staying ;
    if ( curr_time < b [ i ] ) curr_time = b [ i ] ;
  }
  curr_time += ( a [ i ] - b [ i - 1 ] + extra [ i ] ) ;
  System . out . println ( curr_time ) ;
}

public static void solve ( ) { int n = sc . nextInt ( ) ; int [ ] a = new int [ n + 1 ] ; int [ ] b = new int [ n + 1 ] ; int [ ] extra = new int [ n + 1 ] ; long curr_time = 0 ; for ( int i = 1 ; i <= n ; i ++ ) { a [ i ] = sc . nextInt ( ) ; b [ i ] = sc . nextInt ( ) ; } for ( int i = 1 ; i <= n ; i ++ ) { extra [ i ] = sc . nextInt ( ) ; } int i = 0 ; for ( i = 1 ; i < n ; i ++ ) { curr_time += ( a [ i ] - b [ i - 1 ] + extra [ i ] ) ; int staying = ( int ) Math . ceil ( ( b [ i ] - a [ i ] ) / 2.0 ) ; curr_time += staying ; if ( curr_time < b [ i ] ) curr_time = b [ i ] ; } curr_time += ( a [ i ] - b [ i - 1 ] + extra [ i ] ) ; System . out . println ( curr_time ) ; }
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