#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <numeric>
#include <functional>
#include <cmath>
#include <queue>
#include <stack>
#include <set>
#include <map>

#define repd(i,a,b) for (int i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)
typedef long long ll;

using namespace std;


int inputValue(){
    int a;
    cin >> a;
    return a;
};

template <typename T>
void output(T a, int precision) {
    if(precision > 0){
        cout << fixed << setprecision(precision)  << a << "\n";
    }
    else{
        cout << a << "\n";
    }
}

int main() {
    
    // source code
    int N = inputValue();
    
    if (N < 5) {
        output(0, 0);
        return 0;
    }
    double ret = 1;
    
    rep(i, 5){
        ret *= N - i;
        ret /= 99 - i;
    }
    
    ret *= 12;
    output(ret, 10);
    
    
    return 0;
}