#include<iostream>
#include<iomanip>
using namespace std;


int main(){
	cout << fixed;
	int N;cin >> N;
	double p=1;
	for (int i = 0; i < 5; i++)
		p *= N - i, p /= 99 - i;
	cout << p * 12 << endl;
	double res=0;
}