#include<bits/stdc++.h>

using pii = std::pair<int, int>;

using i64 = long long;

static constexpr int mod = 998244353;

class combMath
{
public:
    static constexpr int size = 2e5;
    i64 fact[size + 1];
    i64 finv[size + 1];
    i64 inve[size + 1];
    static constexpr int mod = 998244353;
    void factor()
    {
        fact[0] = 1; fact[1] = 1;
        inv();
        finv[0] = 1;
        finv[1] = inve[1];
        for (int i = 2; i <= size; ++i) fact[i] = fact[i - 1] * i % mod, finv[i] = finv[i - 1] * inve[i] % mod;
    }
    void inv()
    {
        inve[1] = 1;
        for (int i = 2; i <= size; ++i)
        {
            inve[i] = (mod - mod / i) * inve[mod % i] % mod;
        }
    }
public:
    combMath() { factor(); }
    i64 power(i64 x, i64 p)
    {
        i64 temp = p, ans = 1;
        while (temp)
        {
            if (temp & 1) ans = ans * x % mod;
            temp >>= 1;
            x = x * x % mod;
        }
        return ans;
    }
    i64 getInv(i64 x)
    {
        return power(x, mod - 2);
    }
    i64 inv(i64 x)
    {
        return inve[x];
    }
    i64 facInv(i64 x)
    {
        return finv[x];
    }
    i64 getFac(i64 obj)
    {
        return fact[obj];
    }
    i64 perm(i64 n, i64 m, bool mode)
    {
        if (mode) return fact[n] * finv[n - m] % mod;
        else return fact[n] / fact[n - m];
    }
    i64 comb(i64 n, i64 m, bool mode = 1)
    {
        if (mode) return fact[n] * finv[n - m] % mod * finv[m] % mod;
        else return fact[n] / fact[n - m] / fact[m];
    }
    i64 stirling(i64 n, i64 m) // 'n' balls into 'm' boxes, boxes DO NOT differ while balls differ.
    {
        i64 ans = 0;
        for (int i = 0; i < m; ++i)
            ans = (ans + (i & 1 ? -1 : 1) * comb(m, i, 1) * power(m - i, n) % mod) % mod;
        ans = ans * finv[m] % mod;
        return (ans + mod) % mod;
    }
    i64 catalan(int n, int mode) // n different nums pop in a stack in an certain order, how many ramifications there will be.
    {
        std::vector<i64> dp(n + 1, 1);
        if (mode) for (int i = 1; i <= n; ++i) dp[i] = dp[i - 1] * (4LL * i % mod - 2) % mod * inv(i + 1) % mod;
        else for (int i = 1; i <= n; ++i) dp[i] = dp[i - 1] * (4 * i - 2) / (i + 1);
        return dp[n];
    }
} cm;

using namespace std;
void solve()
{
    int m, n;
    cin >> m >> n;
    long long ans = (cm.comb(m, n, 1) * n) % mod;
    vector<vector<long long>>f(m + 1, vector<long long>(20, 0));
    for (int i = 1; i <= m; i++)
    {
        f[i][0] = 1;
        for (int j = (i << 1); j <= m; j += i)
        {
            for (int k = 0; k < 19&&f[i][k]; k++)
            {
                f[j][k + 1] = (f[j][k + 1] + f[i][k]) % mod;
            }
        }
    }
    for (int i = 1; i <= m; i++)
    {
        int cnt = m / i - 1;
        int minn=min(19,n-1);
        for (int j = max(n-cnt-1,0); j <= minn; j++)
            ans = (ans  - f[i][j] * cm.comb(cnt, n - j - 1, 1) % mod) % mod;
        
    }
    cout << (ans+mod)%mod << '\n';
}
int main()
{
    
    solve();
}