public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  long x = sc . nextLong ( ) ;
  long y = sc . nextLong ( ) ;
  long count = 10000000000L ;
  long tmp = y - x ;
  if ( tmp >= 0 ) {
    count = Math . min ( tmp , count ) ;
  }
  tmp = y - x * - 1 + 1 ;
  if ( tmp >= 0 ) {
    count = Math . min ( tmp , count ) ;
  }
  tmp = y * - 1 - x + 1 ;
  if ( tmp >= 0 ) {
    count = Math . min ( tmp , count ) ;
  }
  tmp = y * - 1 - x * - 1 + 2 ;
  if ( tmp >= 0 ) {
    count = Math . min ( tmp , count ) ;
  }
  System . out . println ( count ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; long x = sc . nextLong ( ) ; long y = sc . nextLong ( ) ; long count = 10000000000L ; long tmp = y - x ; if ( tmp >= 0 ) { count = Math . min ( tmp , count ) ; } tmp = y - x * - 1 + 1 ; if ( tmp >= 0 ) { count = Math . min ( tmp , count ) ; } tmp = y * - 1 - x + 1 ; if ( tmp >= 0 ) { count = Math . min ( tmp , count ) ; } tmp = y * - 1 - x * - 1 + 2 ; if ( tmp >= 0 ) { count = Math . min ( tmp , count ) ; } System . out . println ( count ) ; }
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