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)