#include <stdio.h>

#define MOD(x) ((x) % 1000000000000)

int main()
{
	long long N;
	scanf("%lld", &N);

	if (N >= 50)
		printf("000000000000\n");
	else {
		long long n = 1;
		for (long long i = 2; i <= N; i++)
			n = MOD(n * i);

		if (N < 15)
			printf("%lld\n", n);
		else
			printf("%012lld\n", n);
	}
	return 0;
}