#include <bits/stdc++.h>
using namespace std;
int Read() {
  char c;
  while (c = getchar(), (c != '-') && (c < '0' || c > '9'))
    ;
  bool neg = (c == '-');
  int ret = (neg ? 0 : c - 48);
  while (c = getchar(), c >= '0' && c <= '9') ret = ret * 10 + c - 48;
  return neg ? -ret : ret;
}
const int MOD = 9 + 1e9;
int N, W, B;
int Pow(int x, int y) {
  if (y == 1) return x;
  int tmp = Pow(x, y >> 1);
  tmp = (long long)tmp * tmp % MOD;
  return y & 1 ? (long long)tmp * x % MOD : tmp;
}
long long fac(int n) {
  long long ret = 1;
  for (int i = 2; i <= n; i++) (ret *= i) %= MOD;
  return ret;
}
long long C(int n, int m) {
  return fac(n) * Pow(fac(m), MOD - 2) % MOD * Pow(fac(n - m), MOD - 2) % MOD;
}
int main() {
  scanf("%d%d%d", &N, &W, &B);
  printf("%d\n",
         fac(W) * fac(B) % MOD * (W - 1) % MOD * C(W + B - 3, N - 3) % MOD);
  return 0;
}
