#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <stdio.h>
#include <math.h>
#include <iostream>
#include <iomanip>
#include <vector>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <queue>
#include <string>
#include <stack>
#include <numeric>
#include <algorithm>
using namespace std;
using ll = long long;
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
#define rep(i, n) for (ll i = 0; i < n; i++)
#define ALL(a) (a).begin(), (a).end()
void chmin(ll &a, ll b)
{
    if (a > b)
        a = b;
}
void chmax(ll &a, ll b)
{
    if (a < b)
        a = b;
}
int main()
{
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n, k, x;
    cin >> n >> k >> x;
    if (n >= 100)
    {
        cout << 967152772 << endl;
        return 0;
    }
    vector<int> v(n);
    iota(ALL(v), 1);
    ll ans = 0, now = 0;
    do
    {
        if (v[k - 1] == x)
            ans += now;
        now++;
    } while (next_permutation(ALL(v)));
    cout << ans << endl;
    return 0;
}