#include <bits/stdc++.h>

using namespace std;
long fac(int n){
    int f = 1;
    
    for(int i=2; i<=n; ++i) f*= i;
    return f;
}

long countArray(int n, int k, int x) {
    // Return the number of ways to fill in the array.
    
    return fac(k-1)+1;
}

int main() {
    int n;
    int k;
    int x;
    cin >> n >> k >> x;
    long answer = countArray(n, k, x);
    cout << answer << endl;
    return 0;
}