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() {
  long long n, w, b, ans = 0, mod = 1e9 + 9;
  cin >> n >> w >> b;
  for (long long j = 1; j <= b; j++) {
    if (n - j >= 2 && n - j <= w) {
      long long v = 1, now = w;
      for (long long i = 1; i <= n - j; i++) {
        v *= now;
        now--;
        v %= mod;
      }
      now = b;
      for (long long i = 1; i <= j; i++) {
        v *= now;
        now--;
        v %= mod;
      }
      ans += v * (n - 1 - j);
      ans %= mod;
    }
  }
  cout << ans % mod << endl;
}
