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

// コンテスト中のみ
//#define int long long

#define ll long long
#define rep(i,n) for(int i = 0; i < (n); i++)
#define P pair<ll,ll>
#define ld long double
ll INF = (1LL << 60);
int MOD = 998244353;


signed main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	ll N, L; cin >> N >> L;
	if (N <= L) {
		cout << 1 << endl;
	}
	else {
		ll tmp = (N - 1) / L * 2; tmp %= MOD;
		tmp += 1; tmp %= MOD;
		cout << tmp << endl;
	}

	return 0;
}