#include <bits/stdc++.h>
#define ull unsigned long long

#define debug(...) fprintf(stderr,__VA_ARGS__)
using namespace std;

inline static uint read(){
    uint sum=0,neg=0,ch=getchar();
    while(!isdigit(ch)) neg|=(ch=='-'),ch=getchar();
    while(isdigit(ch)) sum=sum*10+(ch^48),ch=getchar();
    return neg?-sum:sum;
}
constexpr uint mod=998244353;
uint n,k,fac[10000005],inv[10000005],f[10000005];
ull power(ull a,uint b=mod-2,ull ret=1){
    for(;b;a=a*a%mod,b>>=1) if(b&1) ret=ret*a%mod;
    return ret;
}
signed main(){
    // freopen("b.in","r",stdin);
    // freopen("b.out","w",stdout);
    n=read(),k=read(),*f=*fac=*inv=1; if(k==1) return puts("1"),0;
    for(uint i=1;i<=n;i++) fac[i]=(ull)fac[i-1]*i%mod; inv[n]=power(fac[n]);
    for(uint i=n-1;i;i--) inv[i]=inv[i+1]*(i+1ll)%mod; ull sum=fac[n-1];
    for(uint i=1;i<=n;i++){
        f[i]=sum*inv[n-i]%mod;
        if(k<=i) sum=(sum+((ull)mod<<30)-(ull)f[i-k]*fac[n-(i-k)-1])%mod;
        if(i<n) sum=(sum+(ull)fac[n-i-1]*f[i])%mod;
    } return printf("%u\n",(f[n]+mod)%mod),0;
}