from functools import reduce


def main():
    MOD = 998244353
    N, A, B = map(int, input().split())
    if A != B:
        # 先頭がBで末尾がAのパターン
        patterns_common = reduce(lambda x, y: ((x %
                                                MOD) * (y %
                                                        MOD)) %
                                 MOD, range(1, N - 1))

        # 先頭がBで末尾がAでないパターン
        patterns_head_B = (reduce(lambda x, y: ((x % MOD) * (y % MOD)) %
                                  MOD, range(1, N - 1)) * (N - 2)) % MOD

        # 先頭がBでなく末尾がAのパターン
        patterns_tail_A = patterns_head_B

        # 先頭がBでなく末尾もAでないパターン
        patterns_except = ((N - 2) * (N - 3) * reduce(lambda x,
                                                      y: ((x % MOD) * (y % MOD)) % MOD, range(1, N - 1))) % MOD

        print((patterns_except +
               patterns_tail_A +
               patterns_head_B +
               patterns_common) %
              MOD)
    else:
        print((N - 1) * (N - 2) * reduce(lambda x, y: ((x %
                                                        MOD) * (y %
                                                                MOD)) %
                                         MOD, range(1, N - 1)) %
              MOD)


if __name__ == "__main__":
    main()