public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int a = sc . nextInt ( ) ;
  int b = sc . nextInt ( ) ;
  int c [ ] = new int [ a ] ;
  for ( int i = 0 ;
  i < a ;
  i ++ ) {
    c [ i ] = sc . nextInt ( ) ;
  }
  int count = 0 ;
  for ( int i = 0 ;
  i < a - 1 ;
  i ++ ) {
    while ( c [ i ] == c [ i + 1 ] ) {
      c [ i + 1 ] = c [ i + 1 ] + b ;
      count ++ ;
    }
    while ( c [ i ] > c [ i + 1 ] ) {
      int d = ( c [ i ] - c [ i + 1 ] ) / b ;
      c [ i + 1 ] = c [ i + 1 ] + b * ( d + 1 ) ;
      count = count + d + 1 ;
    }
  }
  System . out . println ( count ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int a = sc . nextInt ( ) ; int b = sc . nextInt ( ) ; int c [ ] = new int [ a ] ; for ( int i = 0 ; i < a ; i ++ ) { c [ i ] = sc . nextInt ( ) ; } int count = 0 ; for ( int i = 0 ; i < a - 1 ; i ++ ) { while ( c [ i ] == c [ i + 1 ] ) { c [ i + 1 ] = c [ i + 1 ] + b ; count ++ ; } while ( c [ i ] > c [ i + 1 ] ) { int d = ( c [ i ] - c [ i + 1 ] ) / b ; c [ i + 1 ] = c [ i + 1 ] + b * ( d + 1 ) ; count = count + d + 1 ; } } System . out . println ( count ) ; }
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