/*
Telebe of Adicto && Mamedov yani AzeTurk810
I see humans but no humanity
*/
#include <iostream>
//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
using ll = long long;
using namespace std;
#define ln '\n'
#define INFi 1e9
#define INFll 1e18
constexpr int up = 202 , MOD = 1e9 + 7;
int dp[2][up][up][up];
void solve() {
int n ,cs , cf;
cin >> n >> cs >> cf;
dp[0][2][1][2] = 1;
dp[1][2][2][1] = 1;
for(int l = 3;l <= n;l++) {
for(int s = 1;s <= l;s ++) {
for(int f = 1;f <= l; f++) {
if(s == f)
continue;
for(int k = s;k < l;k++) {
dp[0][l][s][f] += dp[1][l - 1][k][f - (f > s)];
dp[0][l][s][f] %= MOD;
}
for(int k = 1;k < s;k++) {
dp[1][l][s][f] += dp[0][l - 1][k][f - (f > s)];
dp[1][l][s][f] %= MOD;
}
}
}
}
cout << (dp[0][n][cs][cf] + dp[1][n][cs][cf]) % MOD << ln;
}
// Attack on titan<3
signed main() {
ios::sync_with_stdio(0);
cin.tie(nullptr);
int t = 1;
// cin >> t;
for(int cases = 0 ; cases < t;cases ++) {
solve();
}
}
// Just Imaginary
