#include <bits/stdc++.h>
using namespace std;
using i128 = __int128_t;
const i128 MOD = 1e9 + 7;
signed main() {
int N, S, T; cin >> N >> S >> T;
i128 n = N, s = S, t = T;
vector<i128> r1({1});
for (int i = 2; i <= n; i++) {
vector<i128> nr1(i, 0);
if (i % 2 == 0) for (int j = 1; j < i; j++) nr1[j] = (r1[j-1] + nr1[j-1]);
else for (int j = i-2; j >= 1; j--) nr1[j] = (nr1[j+1] + r1[j]);
r1 = nr1;
}
vector<vector<i128>> table(n, vector<i128>(n, 0));
table[0] = r1;
for (int i = 1; i < n; i++) {
if (n % 2 == 0) {
for (int j = i+1; j < n; j++) {
table[i][j] = (table[i-1][j] + (table[i-1][j] - table[i-1][j-1]));
}
} else {
int pt = 1;
for (int j = i+1; j < n; j++) {
table[i][j] = table[0][pt];
pt++;
}
}
}
for (int i = 0; i < n; i++) {
for (int j = i+1; j < n; j++) {
table[j][i] = table[i][j];
}
}
// for (int i = 0; i < n; i++) {
// for (int j = 0; j < n; j++) {
// cout << table[i][j] << "\t";
// }
// cout << "\n";
// }
cout << int(table[s-1][t-1] % MOD) << "\n";
}
