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 n, w, b;
long long f[4010], ans, c[4010][4010];
int main() {
  scanf("%d%d%d", &n, &w, &b), f[0] = 1;
  for (int i = 0; c[i][0] = 1, i <= 4000; i++)
    for (int j = 1; j <= i; j++)
      c[i][j] = (c[i - 1][j] + c[i - 1][j - 1]) % 1000000009;
  for (int i = 1; i <= n; i++)
    (ans += c[w - 1][n - 1 - i] * c[b - 1][i - 1] % 1000000009 * (n - 1 - i) %
            1000000009) %= 1000000009;
  for (int i = 1; i <= w; i++) (ans *= i) %= 1000000009;
  for (int i = 1; i <= b; i++) (ans *= i) %= 1000000009;
  printf("%lld\n", ans);
  fclose(stdin), fclose(stdout);
  return 0;
}
