#include<stdio.h>
long long int dp[100005], sum[100005];
int main()
{
	long long int n, k;
	scanf("%lld %lld", &n, &k);
	const long long int p = 998244353;
	long long int i;
	for (i = 0; i <= n; i++)
		dp[i] = sum[i] = 0;
	dp[0] = sum[0] = 1;
	for (i = 1; i <= n; i++)
	{
		if (i - k >= 0)
			dp[i] = (dp[i] + sum[i - k]) % p;
		sum[i] = (sum[i - 1] + dp[i]) % p;
	}
	printf("%lld\n", sum[n]);
	return 0;
}