#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ull;
const double pi = acos(-1.0);
const int mod = 998244353;
const int inf = 0x7fffffff;
const long long INF = 0x7fffffffffffffff;
const int dx[] = {-1, 0, 1, 0}, dy[] = {0, 1, 0, -1};
long long poww(long long a, long long b) {
  long long s = 1;
  while (b) {
    if (b & 1) s = (s * a) % mod;
    a = (a * a) % mod;
    b >>= 1;
  }
  return s % mod;
}
struct CC {
  static const int M = 500010;
  long long fac[M], inv[M];
  CC() {
    fac[0] = 1;
    for (int i = 1; i < M; i++) fac[i] = fac[i - 1] * i % mod;
    inv[M - 1] = poww(fac[M - 1], mod - 2);
    for (int i = M - 2; i >= 0; i--) inv[i] = inv[i + 1] * (i + 1) % mod;
  }
  long long operator()(long long a, long long b) {
    if (a < b || a < 0) return 0;
    return fac[a] * inv[a - b] % mod * inv[b] % mod;
  }
} C;
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int a, b, c, d, e, f, T;
  cin >> a >> b;
  if (a < b) {
    cout << 0 << endl;
    return 0;
  }
  long long n = 0;
  for (int i = 1; i <= a; i++) {
    c = a / i - 1;
    if (c + 1 < b) break;
    n += C(c, b - 1);
    n %= 998244353;
  }
  cout << n << endl;
}
