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;
int main(int argc, char *argv[]) {
  long long n, W, B;
  cin >> n >> W >> B;
  long long f = 1;
  for (int i = 2; i <= W; ++i) {
    f = (f * i) % 1000000009;
  }
  for (int i = 2; i <= B; ++i) {
    f = (f * i) % 1000000009;
  }
  long long total = 0;
  for (int k = 1; k < W; ++k) {
    int start = (((1) < (n - B - (W - k))) ? (n - B - (W - k)) : (1));
    int end = (((k) > (n - 2)) ? (n - 2) : (k));
    for (int a = start; a <= end; ++a) {
      int left = (((1) < (n - a - (W - k))) ? (n - a - (W - k)) : (1));
      int right = (((B) > (n - a - 1)) ? (n - a - 1) : (B));
      int delta = 1 + right - left;
      if (delta > 0) {
        total = (total + f * delta) % 1000000009;
      }
    }
  }
  cout << total << endl;
  return 0;
}
