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;
const long long MOD = 1000000009;
long long fac[4010];
long long powMOD(long long a, long long b) {
  long long ans = b & 1 ? a : 1;
  long long mod = a;
  while (b > 0) {
    b >>= 1;
    mod = (mod * mod) % MOD;
    if (b & 1) ans = (ans * mod) % MOD;
  }
  return ans;
}
int main() {
  long long n, w, b;
  cin >> n >> w >> b;
  fac[0] = 1;
  for (int i = 1; i < 4006; ++i) {
    fac[i] = (i * fac[i - 1]) % MOD;
  }
  long long ans = 0;
  for (long long x = 1; x <= b; ++x) {
    long long black = 1, white = 1;
    black = (fac[b] * fac[b - 1]) % MOD *
            powMOD((fac[x - 1] * fac[b - x]) % MOD, MOD - 2);
    black %= MOD;
    long long y = n - x;
    white = (fac[w] * fac[w - 1]) % MOD *
            powMOD((fac[y - 1] * fac[w - y]) % MOD, MOD - 2) % MOD * (y - 1);
    white %= MOD;
    ans += (black * white) % MOD;
    ans %= MOD;
  }
  cout << ans << endl;
  return 0;
}
