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 int oo = INT_MAX >> 1;
const int Mo = 1000000009;
int C[4100][4100];
long long fac[4100];
int main() {
  int i, j;
  fac[0] = C[0][0] = 1;
  for (i = 1; i <= 4000; i++) {
    fac[i] = fac[i - 1] * i % Mo;
    C[i][0] = 1;
    for (j = 1; j <= i; j++) {
      C[i][j] = C[i - 1][j - 1] + C[i - 1][j];
      if (C[i][j] >= Mo) C[i][j] -= Mo;
    }
  }
  int N, w, b;
  cin >> N >> w >> b;
  long long ans = 0;
  for (i = N - w; i <= b; i++) {
    ans = (ans + ((long long)C[b - 1][i - 1] * fac[b] % Mo) *
                     ((long long)C[w - 1][N - i - 1] * fac[w] % Mo *
                      (N - i - 1) % Mo)) %
          Mo;
  }
  cout << ans << endl;
}
