#include <iostream>
#include <iomanip>
#include <cstdint>

using namespace std;

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);

	uint64_t N, i, ans = 1;
	cin >> N;

	if (N >= 65)
	{
		cout << "000000000000\n";
		return 0;
	}

	bool overflow = false;
	for (i = 2; i <= N; ++i)
	{
		ans *= i;
		if (ans >= 1'000'000'000'000)
			overflow = true, ans %= 1'000'000'000'000;
	}

	if (overflow) cout << setfill('0') << right << setw(12);
	cout << ans << '\n';

	return 0;
}