#include <bits/stdc++.h>

using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()

template<typename A, typename B> inline bool chmax(A &a, B b) { if (a<b) { a=b; return 1; } return 0; }
template<typename A, typename B> inline bool chmin(A &a, B b) { if (a>b) { a=b; return 1; } return 0; }

typedef unsigned long long ull;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, pii> P;

const ll INF = 1ll<<29;
const ll MOD = 1000000007;
const double EPS  = 1e-10;

string to_str(ll x) {
	stringstream ss;
	ss << x;
	return ss.str();
}

int main() {
	ll n;
	cin >> n;
	
	ll ans = 1;
	for (ll i = 1; i < n + 1; i++) {
		ans *= i;
		ans %= 1000000000000ll;
		
		if (ans == 0) break;
	}
	
	string str = to_str(ans);
	
	reverse(ALL(str));
	while (str.size() < 12) str += '0';
	reverse(ALL(str));
	
	if (n >= 15) cout << str << endl;
	else cout << ans << endl;
	
	return 0;
}