def perm(n, k):
    ret = 1
    for i in range(k):
        ret *= (n - i)
        ret %= MOD
    return ret

MOD = 998244353
N, A, B = map(int, input().split())
if A == B:
    ans = perm(N, 2) - 2 * (N - 1)
else:
    ans = perm(N, 2) - 2 * (N - 1) + 1

ans *= perm(N - 2, N - 2)
ans %= MOD
print(ans)