package main

import . "fmt"

func main() {
	var n, a, b int
	Scan(&n, &a, &b)
	
	if n == 2 && a == b {
		Println(0) // 念のため
		return
	}
	
	const Mod = 998244353
	
	var ans int
	
	if a == b {
		ans = (n-1)*(n-2)%Mod
		for i := 1; i <= n-2; i++ {
			ans = ans*i%Mod
		}
		Println(ans)
		return
	}
	
	all := 1
	pre := 1
	dbl := 1
	
	for i := 1; i <= n; i++ {
		all = all*i%Mod
		if i < n {
			pre = pre*i%Mod
		}
		if i < n-1 {
			dbl = dbl*i%Mod
		}
	}
	
	ans = (all + (Mod - pre) + (Mod - pre) + dbl) % Mod
	
	Println(ans)
}