#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll mod = 998244353;

int N, A, B;

int main() {
	cin >> N >> A >> B;
	if(A > B) swap(A, B);
	ll x = A, y = B - A, z = N - B;
	ll fac = 1, nfac = 1;
	for(int i = 1; i <= N - 1; i++) {
		fac = fac * i % mod;
		if(i != y + 1) nfac = nfac * i % mod;
	}
	cout << ((x * x % mod + y * y % mod + z * z % mod) * fac 
			+ 2 * x * z % mod * nfac) % mod << endl;
}