#include <bits/stdc++.h>
using namespace std;

class UnionFind {
private:
  int sz;
  vector<int> par, siz;
public:
  UnionFind() {}
  UnionFind(int n) : sz(n), par(sz), siz(sz, 1) {
    iota(par.begin(), par.end(), 0);
  }
  int root(int x) {
    if (par.at(x) == x) return x;
    else return par.at(x) = root(par.at(x));
  }
  void unit(int x,int y) {
    x = root(x), y = root(y);
    if (x == y) return;
    if (siz.at(x) < siz.at(y)) swap(x, y);
    par.at(y) = x;
    siz.at(x) += siz.at(y);
  }
  int size(int x) {
    x = root(x);
    return siz.at(x);
  }
  bool same(int x, int y) {
    return root(x) == root(y);
  }
};

int main() {
  int N, P;
  cin >> N >> P;
  UnionFind UF(N + 1);
  for (int i = 2; i <= N; i++) {
    for (int j = i + i; j <= N; j += i) UF.unit(j - i, j);
  }
  cout << UF.size(P) << "\n";
}