#include "bits/stdc++.h" #define _CRT_SECURE_NO_WARNINGS #define rep(i,n) for(int i = 0;i < n;i++) #define REP(i,n,k) for(int i = n;i < k;i++) #define P(p) cout << (p) << endl; #define sP(p) cout << setprecision(15) << fixed << p << endl; #define Pi pair #define IINF 1e9 #define LINF 1e18 #define vi vector #define mp make_pair #define pb push_back using namespace std; typedef long long ll; typedef unsigned long long ull; int dx[] = { 0, 1, 0, -1 }; int dy[] = { -1, 0, 1, 0 }; unsigned long long sttoi(std::string str) { unsigned long long ret; std::stringstream ss; ss << str; ss >> ret; return ret; } ull gcd(ull a, ull b) { if (b > a)swap(a, b); if (b == 0) return a; return gcd(b, a%b); } void solve() { int n; cin >> n; double numer = 1, denom = 1; for (int i = 0; i < 5; i++) { numer *= n - i; numer /= i + 1; } for (int i = 0; i < 5; i++) { denom *= 99 - i; denom /= i + 1; } sP((numer / denom) * 12); } int main() { solve(); return 0; }