public static void main ( String [ ] args ) throws Exception {
  BufferedReader bf = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  StringTokenizer st = new StringTokenizer ( bf . readLine ( ) ) ;
  int n = Integer . parseInt ( st . nextToken ( ) ) ;
  int k = Integer . parseInt ( st . nextToken ( ) ) ;
  long ans = 0 ;
  for ( int b = 1 ;
  b <= n ;
  b ++ ) {
    if ( b <= k ) continue ;
    int remainders_per_b = b - 1 - k + 1 ;
    ans += 1L * n / b * remainders_per_b ;
    if ( n % b >= k ) ans += ( n % b ) - k + 1 ;
    if ( k == 0 ) ans -- ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) throws Exception { BufferedReader bf = new BufferedReader ( new InputStreamReader ( System . in ) ) ; StringTokenizer st = new StringTokenizer ( bf . readLine ( ) ) ; int n = Integer . parseInt ( st . nextToken ( ) ) ; int k = Integer . parseInt ( st . nextToken ( ) ) ; long ans = 0 ; for ( int b = 1 ; b <= n ; b ++ ) { if ( b <= k ) continue ; int remainders_per_b = b - 1 - k + 1 ; ans += 1L * n / b * remainders_per_b ; if ( n % b >= k ) ans += ( n % b ) - k + 1 ; if ( k == 0 ) ans -- ; } System . out . println ( ans ) ; }
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