N,A,B = map(int,input().split())
P = 998244353



if A == B:
	ans = 1
	for i in range(1,N):
		ans = ans * i % P
	ans = ans * (N - 2) % P
	print(ans)
else:
	u = 1
	for i in range(1,N - 1):
		u = u * i % P
	tmp = (N - 2) * u
	tmp2 = u
	tmp3 = (N - 2) * (N - 3) * u
	ans = tmp * 2 + tmp2 + tmp3
	print(ans % P)