MOD = 998244353

n, a, b = map(int, input().split())
if a == b:
    ans = n - 2
    for i in range(1, n):
        ans *= i
        ans %= MOD
    print(ans)
else:
    prod = 1
    for i in range(1, n - 1):
        prod *= i
        prod %= MOD

    ans = prod + 2 * (n - 2) * prod + (n - 2) * (n - 3) * prod
    print(ans % MOD)