#define _USE_MATH_DEFINES
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#define _USE_MATH_DEFINES
#include<bits/stdc++.h>
#include<unordered_map>
#include<random>
#include <array>
#include <complex>
using namespace std;
#define LP(I,S,G) for (long long int I = (S); I < (G); ++I)
#define IN(X) 	for (int in = 0; in < X.size(); in++)cin >> X[in]
#define OUT(X) 	for (int in = 0; in < X.size(); in++)cout << X[in]<<" "
#define SORT(X) sort((X).begin(), (X).end())
#define CSORT(X,Y) sort(X.begin(), X.end(),Y)
#define COPY(X,Y) copy(X.begin(), X.end(), Y.begin())
#define ALL(X,Y) for (auto X = (Y).begin(); X != (Y).end(); X++)
#define FULL(a)  (a).begin(),(a).end()
#define BFS(Q,S) for(Q.push(S);Q.size()!=0;Q.pop())
typedef long long int ll;
typedef unsigned long long int ull;
long long int M = 998244353;


int dx[] = { -1,0,1,0 }, dy[] = { 0,1,0,-1 };

ll MAX(ll A, ll B) { return ((A) > (B) ? (A) : (B)); }
ll MIN(ll A, ll B) { return ((A) < (B) ? (A) : (B)); }
inline long long int xor128() {
	static long long int x = 123456789, y = 362436069, z = 521288629, w = 88675123;
	long long int t = (x ^ (x << 11));
	x = y; y = z; z = w;
	return (w = (w ^ (w >> 19)) ^ (t ^ (t >> 8)));
}



int main() {
	ll n, a, b;
	cin >> n >> a >> b;
	ll ans = 1, sub = 1, subsub = 1;
	LP(i, 1, n + 1)ans = (ans*i) % M;
	LP(i, 1, n) sub= (sub*i) % M;
	LP(i, 1, n - 1)subsub = (subsub*i) % M;
	ans = (M + ans - (2 * sub) % M)%M;
	if(a!=b)ans = (ans + subsub) % M;
	cout << ans;
	return 0;
}