#include <stdio.h>

const int Mod = 998244353;

int main()
{
	int N, A, B;
	scanf("%d %d %d", &N, &A, &B);
	
	int i;
	long long ans = 1;
	for (i = 1; i <= N - 2; i++) ans = ans * i % Mod;
	if (A == B) ans = ans * (N - 1) % Mod * (N - 2) % Mod;
	else ans = ans * ((N - 1) + (long long)(N - 2) * (N - 2) % Mod) % Mod;
	printf("%lld\n", ans);
	fflush(stdout);
	return 0;
}