#include "bits/stdc++.h"
using namespace std;
#ifdef _DEBUG
#include "dump.hpp"
#else
#define dump(...)
#endif

#define int long long
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define rrep(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define all(c) begin(c),end(c)
const int INF = sizeof(int) == sizeof(long long) ? 0x3f3f3f3f3f3f3f3fLL : 0x3f3f3f3f;
const int MOD = 1'000'000'007;
template<class T> bool chmax(T &a, const T &b) { if (a < b) { a = b; return true; } return false; }
template<class T> bool chmin(T &a, const T &b) { if (b < a) { a = b; return true; } return false; }

// 0埋め
string fill(const string &s, int length, char c = '0') {
	string prefix = "";
	for (int i = s.size(); i < length; i++)prefix += c;
	return prefix + s;
}

signed main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	int N; cin >> N;
	int a = 1;
	bool f = false;
	const int A = 1000000000000LL;
	rep(i, 1, N + 1) {
		a *= i;
		if (a >= A)
			f = true;
		a %= A;
		if (a == 0) {
			break;
		}
	}
	if (f)
		cout << fill(to_string(a), 12) << endl;
	else
		cout << a << endl;
	return 0;
}