#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
#define fix(x) fixed << setprecision(x)
#define asc(x) x, vector<x>, greater<x>
#define rep(i, n) for(ll i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}
constexpr ll INFLL = (1LL << 62), MOD = 998244353;
constexpr int INF = (1 << 30);

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    ll n,a,b,ans;
    cin >> n >> a >> b;
    if(a==b){
        ans = (n-1) * (n-2) % MOD;
        rep(i,n-2) ans = ans * (i+1) % MOD;
    }else{
        ll x = 1;
        rep(i,n-2) x = x * (i+1) % MOD;
        ans = (x * (((n-2)*(n-2)+n-1)%MOD))%MOD;
    }
    cout << ans << '\n';
    return 0;
}