#include <bits/stdc++.h>
using namespace std;

bool isPrime( long long x )
{
	if( x < 2 ) return false;
	if( x == 2 ) return true;
	if( x % 2 == 0 ) return false;
	for( long long i = 3; i * i <= x; i += 2 ) {
		if( x % i == 0 ) return false;
	}
	return true;
}

int main()
{
	int N;
	cin >> N;

	long long ans = 1;
	if( N > 1 ) {
		vector<long long> p;
		for( long long i = 100000 + 1; p.size() < N; i++ ) {
			if( isPrime( i ) ) p.push_back( i );
		}
		vector<long long> ans1;
		for( int i = 0; i < N; i++ ) {
			for( int j = 0; j < N; j++ ) {
				ans1.push_back( p[i] * p[j] );
			}
		}
		sort( ans1.begin(), ans1.end() );
		unique( ans1.begin(), ans1.end() );
		ans = ans1[N - 2];
	}

	cout << ans << endl;
}