#include <bits/stdc++.h>

#define setIO(s) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)

using namespace std;

typedef long long ll;

const int mod = 1000000009 ;

int fac[4010], inv[4010];

int qpow(int x, int y) {

	int ans = 1;

	while (y) {

		if (y & 1) {

			ans = (ll)ans * x % mod;

		}

		y >>= 1;

		x = (ll)x * x % mod;

	}

	return ans;

}

inline int C(int x, int y) {

	if (x < y) {

		return 0;

	}

	return (ll)fac[x] * inv[x - y] % mod * inv[y] % mod;

}

int main() {

	// setIO("count");

	int n, w, b;

	cin >> n >> w >> b ;

	fac[0] = 1, inv[0] = 1;

	for (int i = 1; i <= 4000; i ++ ) {

		fac[i] = (ll)fac[i - 1] * i % mod;

		inv[i] = qpow(fac[i], mod - 2);

	}

	int ans = 0;

	for (int i = 2; i <= n; i ++ ) {

		for (int j = i; j < n; j ++ ) {

			// i, j

			ans = (ans + (ll)fac[w] * fac[b] % mod * C(w - 1, n - j + i - 2) % mod * C(b - 1, j - i) % mod) % mod;

		}

	}

	cout << ans << endl ;

	// fclose(stdin);

	// fclose(stdout);

	return 0;

}