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

#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define pb push_back
#define x first
#define y second
#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define RFOR(i, a, b) for(int i = (a) - 1; i >= (b); i--)

typedef long long ll;
typedef double db;
typedef long double LD;
typedef pair<int, int> pii;
typedef pair<db, db> pdd;
typedef pair<ll, ll> pll;

const int MOD = 998244353;

ll add(ll a, ll b)
{
	return a + b >= MOD ? a + b - MOD : a + b;
}

ll sub(ll a, ll b)
{
	return a - b < 0 ? a - b + MOD : a - b;
}

ll mult(ll a, ll b)
{
	return a * b % MOD;
}

int solve()
{
	int r, c;
	if (!(cin >> r >> c))
		return 1;
	
	vector dp(c, vector<ll>(r));
	FOR (i, 0, r)
		dp[0][i] = 1;
	FOR (i, 1, c)
	{
		FOR (j, 0, r)
		{
			ll smpr = 0;
			FOR (k, 0, r)
				smpr = add(smpr, dp[i - 1][k]);
			smpr = sub(smpr, dp[i - 1][j]);
			dp[i][j] = smpr;
		}
	}
	ll ans = 0;
	FOR (i, 0, r)
		ans = add(ans, dp[c - 1][i]);
	cout << ans << '\n';
	
	return 0;
}

int32_t main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	int TET = 1e9;
	//cin >> TET;
	for (int i = 1; i <= TET; i++)
	{
		if (solve())
		{
			break;
		}
		#ifdef ONPC
			cerr << "_____________________________\n";
		#endif
	}
	#ifdef ONPC
		cerr << "\nfinished in " << clock() * 1.0 / CLOCKS_PER_SEC << " sec\n";
	#endif
	return 0;
}