#pragma GCC optimize("Ofast,unroll-loops,O3")
#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include "algo/debug.h"
#else
#define debug(...) 73
#endif
using int64 = int64_t;
using ld = long double;
using uint64 = uint64_t;
using int128 = __int128_t;
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
const int md = 1e9 + 7;
const int64 inf = 1e18;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
int n, cs, cf;
cin >> n >> cs >> cf;
vector<int> a(n);
for (int i = 0; i < n; i++) {
a[i] = i + 1;
}
int cnt = 0;
do {
if (a[0] == cs && a.back() == cf) {
bool can = true;
for (int i = 1; i < n - 1; i++) {
if (a[i + 1] > a[i] && a[i] > a[i - 1]) {
can = false;
break;
}
}
for (int i = 1; i < n - 1; i++) {
if (a[i + 1] < a[i] && a[i] < a[i - 1]) {
can = false;
break;
}
}
cnt += int(can);
}
} while (next_permutation(all(a)));
cout << cnt << '\n';
return 0;
}
