#include <bits/stdc++.h>

using namespace std;
#define int long long
#define app push_back
const int p=998244353;
int po(int a,int b) {if(b==0) return 1; if(b==1) return a; if(b%2==0) {int u=po(a,b/2);return (u*u)%p;} else {int u=po(a,b-1);return (a*u)%p;}}
int inv(int x) {return po(x,p-2);}
int32_t main()
{
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int n,q;cin>>n>>q;
    int ans=1;
    for(int i=1;i<=n;++i) {ans*=i;ans%=p;} int o=n*(n+1)/2; o%=p;
    for(int i=0;i<q-1;++i) {ans*=o;ans%=p;}
    ans*=q;ans%=p;
    int s=0;
    for(int i=1;i<=n;++i) {s+=(((n+1)*(n-i+1))%p)*inv(i+1);s%=p;}
    ans*=s;ans%=p;
    cout<<ans;
    return 0;
}