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>
int a[200010], l[200010], c[1000];
using namespace std;
long long pow(long long a, long long n) {
  if (n == 0) return 1;
  if (n % 2 == 1)
    return pow(a, n - 1) * a % 1000000009;
  else {
    int b = pow(a, n / 2);
    return b * b % 1000000009;
  }
}
int main() {
  long long n, w, b, i, j;
  cin >> n >> w >> b;
  long long rez = 1;
  for (i = 1; i < w + 1; i++) rez = rez * i % 1000000009;
  for (i = 1; i < b + 1; i++) rez = rez * i % 1000000009;
  rez = rez * (w - 1) % 1000000009;
  for (i = 1; i < w + b - 2; i++) rez = rez * i % 1000000009;
  for (i = 2; i < n - 2; i++) {
    rez = rez * pow(i, 1000000007);
    rez = rez % 1000000009;
  }
  for (i = 2; i < w + b - n + 1; i++) {
    rez = rez * pow(i, 1000000007);
    rez = rez % 1000000009;
  }
  cout << rez;
  return 0;
}
