#include <bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
#define pb push_back
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;

constexpr ll MOD = 998244353;

ll bpow(ll a, ll b) {
    ll res = 1;
    ll p = a;
    while(b > 0) {
        if(b%2==1)
            res = res*p%MOD;
        p = p*p%MOD;
        b/=2;
    }
    return res;
}

ll inv(ll a) {
    return bpow(a, MOD-2);
}

int main() {
	cin.tie(0)->sync_with_stdio(0);
    int n, k;
    cin >> n >> k;
    ll p = 2*k*inv(2*k+1)%MOD;
    cout << bpow(p, 2*k)*n%MOD << "\n";
}