#include<cstdio>
#include <iostream>
#include<algorithm>
#include<string>
#include<queue>
#include<vector>
#include<functional>
#include<cmath>
#include<map>
#include<stack>
#include<set>
#include<numeric>

#define mod (ll)(1e9+7);

using namespace std;
typedef long long ll;
typedef pair<ll, ll> Pr;

ll N;
string cur,pre;

int main()
{
	cin >> N;

	ll ans = 1;
	bool flag = true;
	for (int i = 1; i <= N; i++) {
		string s = "";
		ans *= i;
		cur = to_string(ans);
		if (cur.size() >= 12 && pre.size() >= 12) {
			for (int j= 1; j <= 12; j++) {
				s += cur[cur.size() - (12 - j + 1)];
				if (cur[cur.size() - j] != pre[pre.size() - j]) {
					flag = false;
				}
			}
			ans = stoll(s);
			if (flag) {
				break;
			}
		}
		pre = cur;
	}
	cout << ans << endl;
	return 0;
}