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

int main( int argc, char *argv[] )
{
const char *lpAns[] =
{
"1",
"2",
"6",
"24",
"120",
"720",
"5040",
"40320",
"362880",
"3628800",
"39916800",
"479001600",
"6227020800",
"87178291200",
"307674368000",
"922789888000",
"687428096000",
"373705728000",
"100408832000",
"008176640000",
"171709440000",
"777607680000",
"884976640000",
"239439360000",
"985984000000",
"635584000000",
"160768000000",
"501504000000",
"543616000000",
"308480000000",
"562880000000",
"012160000000",
"401280000000",
"643520000000",
"523200000000",
"835200000000",
"902400000000",
"291200000000",
"356800000000",
"272000000000",
"152000000000",
"384000000000",
"512000000000",
"528000000000",
"760000000000",
"960000000000",
"120000000000",
"760000000000",
"240000000000",
"000000000000"
};

const long long iMod = 1000000000000;
long long N;

	// 入力
	cin >> N;

	// 出力
	if( N >= 50 )
		cout << lpAns[ 49 ] << endl;
	else
		cout << lpAns[ N - 1 ] << endl;

	return 0;
}