3 3 1
 300 2 300
 4000 4000 1
 4000 4000 100
 4 2 3
 3 300 300
 4000 100 4000
 3 300 1
 300 300 1
 4000 1000 3000
 3 2 4000
 4 3 2
 3 2 300
 4000 3998 2
 100 200 300
 300 300 300
 3 3 3
 10 10 10
 10 4 9
 239 300 231
 4000 2 3998
 200 100 300
 4000 2000 2000
 4000 4000 4000
 10 7 5
 4000 100 3900
 3 4000 4000

12
 775907030
 63263244
 994443885
 24
 496527918
 908339579
 828107078
 775907030
 876839920
 938379934
 48
 196174631
 296557186
 316471646
 375912430
 72
 318389383
 135283173
 774612666
 686088712
 949581532
 310481606
 997463324
 130636800
 221262673
 680114446

#include <bits/stdc++.h>
using namespace std;
namespace Flandre_Scarlet {
long long n, w, b;
void R1(long long &x) {
  x = 0;
  char c = getchar();
  long long f = 1;
  while (c < '0' or c > '9') f = (c == '-') ? -1 : 1, c = getchar();
  while (c >= '0' and c <= '9')
    x = (x << 1) + (x << 3) + (c ^ 48), c = getchar();
  x = (f == 1) ? x : -x;
}
void Input() { R1(n), R1(w), R1(b); }
long long qpow(long long a, long long b, long long m) {
  long long r = 1;
  while (b) {
    if (b & 1) r = r * a % 1000000009;
    a = a * a % 1000000009, b >>= 1;
  }
  return r;
}
long long inv(long long x) { return qpow(x, 1000000009 - 2, 1000000009); }
long long fac[4333], ifac[4333];
long long C(long long n, long long m) {
  if (m > n) return 0;
  return fac[n] * ifac[m] % 1000000009 * ifac[n - m] % 1000000009;
}
void Soviet() {
  for (long long i = 0; i <= n; ++i)
    fac[i] = (i == 0) ? 1 : fac[i - 1] * i % 1000000009;
  for (long long i = n; i >= 0; --i)
    ifac[i] = (i == n) ? (inv(fac[n])) : (ifac[i + 1] * (i + 1)) % 1000000009;
  long long ans = 0;
  for (long long i = 1; i <= b; ++i) {
    long long now = n - i - 1;
    if (!now) break;
    now = now * C(b - 1, i - 1) % 1000000009;
    now = now * fac[b] % 1000000009;
    now = now * C(w - 1, n - i - 1) % 1000000009;
    now = now * fac[w] % 1000000009;
    ans = (ans + now) % 1000000009;
  }
  printf("%I64d\n", ans);
}
void IsMyWife() {
  Input();
  Soviet();
}
}  // namespace Flandre_Scarlet
int main() {
  Flandre_Scarlet::IsMyWife();
  getchar();
  getchar();
  return 0;
}
