#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cmath>
#include <iostream>
#include <queue>
#include <list>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;


int main(){
  int N;

  cin >> N;

  if(N<=4){
    cout << 0 << endl;
    return 0;
  }

  double ret = 0.0;
  rep(i,5){
    ret += log(N-i) - log(99-i);
  }
  ret = 12.0 * exp(ret);

  printf("%.9lf\n", ret);
  return 0;
}