#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

struct combi{
	deque<mint> kaijou;
	deque<mint> kaijou_;
	
	combi(int n){
		kaijou.push_back(1);
		for(int i=1;i<=n;i++){
			kaijou.push_back(kaijou[i-1]*i);
		}
		
		mint b=kaijou[n].inv();
		
		kaijou_.push_front(b);
		for(int i=1;i<=n;i++){
			int k=n+1-i;
			kaijou_.push_front(kaijou_[0]*k);
		}
	}
	
	mint combination(int n,int r){
		if(r>n)return 0;
		mint a = kaijou[n]*kaijou_[r];
		a *= kaijou_[n-r];
		return a;
	}
	
	mint junretsu(int a,int b){
		mint x = kaijou_[a]*kaijou_[b];
		x *= kaijou[a+b];
		return x;
	}
	
	mint catalan(int n){
		return combination(2*n,n)/(n+1);
	}
	
};


int main(){
	
	int N,M,K;
	cin>>N>>M>>K;
	mint ans = 0;
	combi C(500000);
	if(M==0&&K==0){
		ans = C.kaijou[N];
	}
	else if(M+K>=N){
		int r = M+K;
		r -= N;
		M -= r;
		K -= r;
		rep(i,min(M,K)+1){
			ans += C.combination(M,i) * C.combination(K,i) * C.kaijou[i];
		}
		
	}
	else{
		vector dp(N+1,vector<mint>(2,0));
		dp[0][0] = 1;
		rep(i,N){
			rep(j,2){
				dp[i+1][0] += dp[i][j];
				dp[i+1][1] += dp[i][j] * (i+1);
			}
		}
		
		vector<mint> a(N+1,0),b(N+1,0);
		rep(i,min(M,K)+1){
			int num = M+K;
			num -= i;
			mint v = C.combination(M,i);
			v *= C.combination(K,i);
			v *= C.kaijou[i];
			num--;
			num+=i;
			v *= C.kaijou_[num];
			a[num] += v;
			//cout<<num<<','<<a[num].val()<<endl;
		}
		rep(i,N-M-K+1){
			mint v = 1;//C.kaijou_[i];
			v *= dp[N-M-K-i][0];
			v *= C.combination(N-M-K,i);
			b[i] = v;
			//cout<<b[i].val()<<endl;
		}
		
		auto c = convolution(a,b);
		rep(i,c.size()){
			ans += c[i] * C.kaijou[i];
		}
	}
	cout<<ans.val()<<endl;
	
	return 0;
}