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 T[50], J, m, n, i, j, k, l, r, K, K0, x, y, first, second, xx, yy;
int D[4001][4001];
long long A = 0;
int main() {
  cin >> n >> x >> y;
  m = (x > y ? x : y);
  D[0][0] = 1;
  for (i = 1; i <= m; i++)
    for (j = i; j <= m; j++)
      D[i][j] = (D[i][j - 1] + D[i - 1][j - 1]) % 1000000009ll;
  for (i = 2; i < n; i++)
    for (j = i; j < n; j++)
      A = (A + (long long)D[j - i + 1][y] * D[n - j + i - 1][x]) % 1000000009ll;
  for (i = 1; i <= x; i++) A = (A * i) % 1000000009ll;
  for (i = 1; i <= y; i++) A = (A * i) % 1000000009ll;
  cout << A << endl;
  return 0;
}
