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 long long mo = 1000000009;
long long n, a, b, len, ans;
long long calc(long long q, long long t) {
  long long p = 1;
  for (long long i = 1; i <= t; i++) {
    p *= q;
    p %= mo;
    q--;
  }
  return p;
}
long long min(long long a, long long b) {
  if (a > b) return b;
  return a;
}
int main() {
  cin >> n >> a >> b;
  for (long long i = 1; i <= min(b, n - 2); i++) {
    long long q = calc(a, n - i);
    long long p = calc(b, i);
    long long sum = (q * p) % mo;
    sum *= n - i - 1;
    sum %= mo;
    ans += sum;
    ans %= mo;
  }
  cout << ans << endl;
}
