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>
#pragma comment(linker, "/STACK:1024000000,1024000000")
using namespace std;
int n, w, b, c[4005][4005], fac[4005];
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> n >> w >> b;
  c[0][0] = 1;
  for (int i = 1; i <= 4000; i++) {
    c[i][0] = 1;
    for (int j = 1; j <= i; j++) {
      c[i][j] = (c[i - 1][j] + c[i - 1][j - 1]) % 1000000009;
    }
  }
  fac[0] = 1;
  for (int i = 1; i <= 4000; i++) {
    fac[i] = (1ll * fac[i - 1] * i) % 1000000009;
  }
  long long ans = 0;
  for (int i = 2; i <= n - 1; i++) {
    for (int j = i; j <= n - 1; j++) {
      int bd = j - i + 1, wd = n - bd;
      ans = (ans + (1ll * fac[b] * c[b - 1][bd - 1] % 1000000009) *
                       (1ll * fac[w] * c[w - 1][wd - 1] % 1000000009) %
                       1000000009) %
            1000000009;
    }
  }
  cout << ans << endl;
  return 0;
}
