public static void main ( String [ ] args ) throws IOException {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  String [ ] tmpArray = br . readLine ( ) . split ( " " ) ;
  int n = Integer . parseInt ( tmpArray [ 0 ] ) ;
  int k = Integer . parseInt ( tmpArray [ 1 ] ) ;
  long result = 0 ;
  for ( int b = 1 ;
  b <= n ;
  b ++ ) {
    int p = n / b ;
    int r = n % b ;
    result += p * Math . max ( 0 , b - k ) + Math . max ( 0 , r - k + 1 ) ;
  }
  if ( k == 0 ) {
    result -= n ;
  }
  System . out . println ( result ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; String [ ] tmpArray = br . readLine ( ) . split ( " ▁ " ) ; int n = Integer . parseInt ( tmpArray [ 0 ] ) ; int k = Integer . parseInt ( tmpArray [ 1 ] ) ; long result = 0 ; for ( int b = 1 ; b <= n ; b ++ ) { int p = n / b ; int r = n % b ; result += p * Math . max ( 0 , b - k ) + Math . max ( 0 , r - k + 1 ) ; } if ( k == 0 ) { result -= n ; } System . out . println ( result ) ; }
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