public static void main ( String [ ] args ) {
  Scanner s = new Scanner ( System . in ) ;
  int sum = 0 , sum1 = 0 , i = 0 , j = 1 , k = 0 ;
  int a = s . nextInt ( ) ;
  int b = s . nextInt ( ) ;
  if ( a > b ) {
    int temp = a ;
    a = b ;
    b = temp ;
  }
  int diff = b - a ;
  if ( diff % 2 != 0 ) {
    int d = ( 0 + diff ) / 2 ;
    for ( i = a ;
    i < a + d ;
    i ++ ) {
      sum = sum + ( j ) ;
      j ++ ;
    }
    sum = sum * 2 ;
    System . out . println ( sum + ( j ) ) ;
  }
  else {
    sum = 0 ;
    int d = ( 0 + diff ) / 2 ;
    for ( k = a ;
    k < a + d ;
    k ++ ) {
      sum = sum + ( j ) ;
      j ++ ;
    }
    sum = sum * 2 ;
    System . out . println ( sum ) ;
  }
}

public static void main ( String [ ] args ) { Scanner s = new Scanner ( System . in ) ; int sum = 0 , sum1 = 0 , i = 0 , j = 1 , k = 0 ; int a = s . nextInt ( ) ; int b = s . nextInt ( ) ; if ( a > b ) { int temp = a ; a = b ; b = temp ; } int diff = b - a ; if ( diff % 2 != 0 ) { int d = ( 0 + diff ) / 2 ; for ( i = a ; i < a + d ; i ++ ) { sum = sum + ( j ) ; j ++ ; } sum = sum * 2 ; System . out . println ( sum + ( j ) ) ; } else { sum = 0 ; int d = ( 0 + diff ) / 2 ; for ( k = a ; k < a + d ; k ++ ) { sum = sum + ( j ) ; j ++ ; } sum = sum * 2 ; System . out . println ( sum ) ; } }
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