// yukicoder: No.554 recurrence formula
// 2019.4.20 bal4u

#include <stdio.h>

int main()
{
	int i, n;
	long long Sodd, Seven, odd, even;

	scanf("%d", &n);
	Sodd = odd = 1, Seven = even = 0;
	for (i = 2; i <= n; i++) {
		if (i & 1) odd = i*Seven, Sodd += odd;
		else even = i*Sodd, Seven += even;
	}
	printf("%lld\n", n & 1? odd: even);
	return 0;
}