#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main() {
ios_base::sync_with_stdio(0);
cout.tie(0);
int n, cs, cf; cin >> n >> cs >> cf;
vector<int> v;
for(int i = 1;i <= n;i++) {
if(i != cs && i != cf) v.push_back(i);
}
int cnt = 0;
do{
vector<int> path;
path.push_back(cs);
for(auto &i : v) path.push_back(i);
path.push_back(cf);
bool pre = (path[1] > path[0]), is = 1;
for(int i = 2;i < path.size();i++) {
bool now = (path[i] > path[i-1]);
if(pre == now) {
is = 0;
break;
}
pre = now;
}
cnt += is;
}while(next_permutation(v.begin(), v.end()));
cout << cnt << "\n";
}
