public static void main ( String [ ] args ) {
  double a ;
  double b ;
  double x ;
  Scanner sc = new Scanner ( System . in ) ;
  a = sc . nextDouble ( ) ;
  b = sc . nextDouble ( ) ;
  x = ( a + b ) / 2 ;
  x = Math . ceil ( x ) ;
  System . out . println ( ( int ) x ) ;
  sc . close ( ) ;
}

public static void main ( String [ ] args ) { double a ; double b ; double x ; Scanner sc = new Scanner ( System . in ) ; a = sc . nextDouble ( ) ; b = sc . nextDouble ( ) ; x = ( a + b ) / 2 ; x = Math . ceil ( x ) ; System . out . println ( ( int ) x ) ; sc . close ( ) ; }
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