#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> P;
#define REP(i,n) for(ll i=0;i<ll(n);i++)


const ll MOD=998244353;

ll dp[100010];




int main(void){
	cin.tie(nullptr);  ios_base::sync_with_stdio(false);

	ll i;


	ll N,K;
	cin >> N >> K;

	dp[0]=1;

	for(i=1;i<=N;i++){

			dp[i]+=dp[i-1];
			dp[i]%=MOD;
			if(i-K>=0) dp[i]+=dp[i-K];
			dp[i]%=MOD;

	}


	cout << dp[N] << endl;




	return 0;

}