N, A, B = map(int, input().split())
mod = 998244353
ans = 0

n = 202020
fact = [1] * (n + 1)
invfact = [1] * (n + 1)
for i in range(1, n):
    fact[i + 1] = ((i+1) * fact[i]) % mod

if A != B:
    ans = fact[N] - 2 * fact[N - 1] + fact[N - 2]
else:
    ans = fact[N] - 2 * fact[N - 1]
print(ans%mod)