#include <bits/stdc++.h>

#define File(a) freopen(a ".in", "r", stdin), freopen(a ".out", "w", stdout)

const int N = 200005;
const int Mod = 998244353;

int iv[N];

int main() {
  int n, a, b;
  scanf("%d %d %d", &n, &a, &b);
  if (a + b > n) {
    int now = a + b - n;
    n -= now, a -= now, b -= now;
  }
  iv[1] = 1;
  for (int i = 2; i <= n; ++i) iv[i] = 1ll * (Mod - Mod / i) * iv[Mod % i] % Mod;
  int ans = 0;
  for (int i = 0, Ca = 1, Cb = 1; i <= std::min(a, b); ++i) {
    ans = (ans + 1ll * Ca * Cb) % Mod;
    Ca = 1ll * Ca * (a - i) % Mod * iv[i + 1] % Mod;
    Cb = 1ll * Cb * (b - i) % Mod;
  }
  for (int i = a + b + 1; i <= n; ++i) ans = 1ll * ans * i % Mod;
  printf("%d\n", ans);
  return 0;
}