#include<bits/stdc++.h>
#pragma GCC optimize(3)
typedef unsigned long long u64;
const int M=998244353;
int n,m,i,j,k;
int s,p[10086],l[100086],D[100086];
bool b[100086];
u64 F[100086],G[100086];
u64 *f[100086],*g[100086];
int d[100086];
u64 ans;
u64 pow(u64 u,u64 d){
    if(!u)return 1;
    u64 r=pow(u>>1,d);
    r*=r;
    if(u&1)(r%=M)*=d;
    return r%M;
}
u64 C(int n,int m){
    if(n<m)return 0;
    return F[n]*G[m]%M*G[n-m]%M;
}
std::vector <int> fac[100086];
int main(){
    scanf("%d%d",&n,&m);
    if(m==1){
        printf("0");
        return 0;
    }
    F[0]=1;
    for(i=1;i<=n;++i)F[i]=F[i-1]*i%M;
    G[n]=pow(M-2,F[n]);
    for(i=n;i;--i)G[i-1]=G[i]*i%M;
    for(i=2;i<=n;++i){
        if(!b[i])p[s++]=i,l[i]=i,D[i]=2;
        for(j=0;j<s&&p[j]<=i&&(k=i*p[j],k<=n);++j)
            b[k]=1,l[k]=p[j],D[k]=D[i]+1;
    }
    for(int i = 1; i <= n; i ++)
        for(int j = i+i; j <= n; j += i)
            fac[j].push_back(i);
    if(m==2){
        ans=(u64)n*(n-1);
        for(i=1;i<=n;++i)ans-=fac[i].size()*2;
        printf("%llu",ans%M);
        return 0;
    }
    D[1]=1;
    for(i=1;i<=n;++i){
        g[i]=new u64[D[i]+1];
        for(j=0;j<D[i];++j)g[i][j+1]=0;
        g[i][0]=1;
        for(int j : fac[i]){
            for(k=0;k<=D[j];++k)(g[i][k+1]+=g[j][k])%=M;
        }
    }
    for(i=1;i<=n;++i)if(d[n/i]<D[i])d[n/i]=D[i];
    for(i=n;i;--i)
        for(k=2;k<=i&&i/k>=m-d[i];++k)
        if(d[i/k]<d[i])d[i/k]=d[i];
    for(i=1;i<=n;++i)if(d[i]){
        f[i]=new u64[d[i]+1];
        for(j=0;j<=d[i]&&j<m;++j){
            f[i][j]=C(i,m-j);
            for(k=2;k<=i&&i/k>=m-j;++k)
                (f[i][j]+=M-f[i/k][j])%=M;
        }
    }
    for(i=1;i<=n;++i)
    for(j=0;j<=D[i]&&j<m;++j){
        u64 u=f[n/i][j]+C(n/i-1,m-j)+M-C(n/i,m-j);
        ans+=g[i][j]*u%M*(m-j)%M;
        if(j)ans+=g[i][j-1]*u%M*(m-j)%M;
    }
    printf("%llu",ans%M);
    return 0;
}