import std.algorithm, std.array, std.container, std.range;
import std.string, std.conv;
import std.math, std.bigint, std.bitmanip, std.random;
import std.stdio, std.typecons;

void main()
{
  auto rd = readln.split.map!(to!int);
  auto n = rd[0], k = rd[1];

  auto pfi = primeFactors(n);
  
  writeln(pfi.filter!(pf => pf >= k).array.length);
}

int[] primeFactors(int n)
{
  auto sieve = new int[n + 1];

  foreach (p; 2..n + 1)
    if (sieve[p] == 0)
      foreach (q; iota(p, n + 1, p))
        sieve[q] += 1;

  return sieve;
}