#include <set>
#include <map>
#include <cmath>
#include <queue>
#include <cstdio>
#include <cassert>
#include <cstring>
#include <iostream>
#include <algorithm>
#define pii pair <int , int>
#define pll pair <LL , LL>
#define mp make_pair
#define fs first
#define sc second
using namespace std;
typedef long long LL;

//const int Mxdt=100000;
//static char buf[Mxdt],*p1=buf,*p2=buf;
//#define getchar() p1==p2&&(p2=(p1=buf)+fread(buf,1,Mxdt,stdin),p1==p2)?EOF:*p1++;


template <typename T>
void read(T &x) {
	T f=1;x=0;char s=getchar();
	while(s<'0'||s>'9') {if(s=='-') f=-1;s=getchar();}
	while(s>='0'&&s<='9') {x=(x<<3)+(x<<1)+(s^'0');s=getchar();}
	x *= f;
}

template <typename T>
void write(T x , char s='\n') {
	if(!x) {putchar('0');putchar(s);return;}
	if(x<0) {putchar('-');x=-x;}
	T t = 0 , tmp[25] = {};
	while(x) tmp[t ++] = x % 10 , x /= 10;
	while(t -- > 0) putchar(tmp[t] + '0');
	putchar(s);
}

const int MAXN = 3e5 + 5;
const int B = 800;
const int mod = 998244353;

inline int Add(int x , int y) {x += y;return x >= mod?x - mod:x;}
inline int Sub(int x , int y) {x -= y;return x < 0?x + mod:x;}
inline int Mul(int x , int y) {return 1ll * x * y % mod;}

inline int qpow(int a , int b) {
	int res = 1;
	while(b) {
		if(b & 1) res = Mul(res , a);
		a = Mul(a , a);
		b >>= 1;
	}
	return res;
}

int f[(B << 2) + 5][(B << 1) + 5] , n , c;

inline int Get(int x) {
	return (x % (B << 2));
}

int g[2][B * (B + 1) + 5];

int main() {
	read(n),read(c);
	for (int i = 1; i < n; ++i) {
		int cur = Get(i);
		if(i <= B) f[cur][i] = Add(f[cur][i] , 1);
		for (int j = 1; j <= B * 2; ++j) if(i + j - 1 <= n) {
			if(j > 1 && i + j - 1 <= n) f[Get(i + j - 1)][j - 1] = Add(f[Get(i + j - 1)][j - 1] , Mul(c , f[cur][j]));
			if(j < B * 2 && i + j + 1 <= n) f[Get(i + j + 1)][j + 1] = Add(f[Get(i + j + 1)][j + 1] , f[cur][j]);
			f[cur][j] = 0;
		} 
	}
	int ans = 0;
	for (int j = 1; j <= B * 2; ++j) ans = Add(ans , f[Get(n)][j]);
	int Z = B * (B + 1) / 2;
	g[1][Z] = 1;
	if(n > B) ans = Add(ans , 1);
	int lim = B * (B + 1);
	for (int i = 2; i <= B; ++i) {
		for (int j = 0; j <= lim; ++j) {
			g[i & 1][j] = 0;
			if(j >= i) g[i & 1][j] = Add(g[i & 1][j] , g[(i - 1) & 1][j - (i - 1)]);
			if(j + i <= lim) g[i & 1][j] = Add(g[i & 1][j] , Mul(g[(i - 1) & 1][j + (i - 1)] , c));
		}
		for (int j = B + 1; j <= n; ++j) if(n - j * i + Z <= lim && n - j * i + Z >= 0) ans = Add(ans , g[i & 1][n - j * i + Z]);
	}
	write(ans);
	return 0;
}