#include<bits/stdc++.h>
using namespace std;
#define rep_(i, a_, b_, a, b, ...) for (int i = (a), lim##i = (b); i < lim##i; ++i)
#define rep(i, ...) rep_(i, __VA_ARGS__, __VA_ARGS__, 0, __VA_ARGS__)
using ll = long long;

int main() {
  ll n, k; cin >> n >> k;
  unordered_map<ll, ll> dp;
  dp[k] = 1;
  rep(i, 1, n+1) {
    unordered_map<ll, ll> tmp(dp);
    for (auto [x, y] : tmp) if (x >= i) dp[x/i] += y;
  }
  ll ans = -1;
  for (auto [x, y] : dp) if (x) ans += y;
  cout << ans << '\n';
}