def main():
    from sys import stdin, setrecursionlimit
    # setrecursionlimit(1000000)
    input = stdin.readline
    def iinput(): return int(input())
    def sinput(): return input().rstrip()
    def i0input(): return int(input()) - 1
    def linput(): return list(input().split())
    def liinput(): return list(map(int, input().split()))
    def miinput(): return map(int, input().split())
    def li0input(): return list(map(lambda x: int(x) - 1, input().split()))
    def mi0input(): return map(lambda x: int(x) - 1, input().split())
    INF = 1000000000000000000
    MOD = 998244353

    N, A, B = miinput()


    tmp = 1

    for i in range(1, N-1):
        tmp *= i
        tmp %= MOD
    ans = tmp * (N - 1) % MOD * N % MOD
    ans -= tmp * (N - 1) % MOD * 2 % MOD
    ans %= MOD
    if A == B:
        print(ans)
        return
    ans += tmp
    ans %= MOD
    print(ans)
    

main()