#include <fstream>

int p, n=1, c=1;
long long int factorial = 1;
bool gasit = false;

int nrzero(int x) {
	int c = 0;
	while (x) {
		if (x % 10 == 0) c++;
		x %= 10;
	}
	return c;
}


int main() {
	std::ifstream fin("fact.in");
	std::ofstream fout("fact.out");
	fin >> p;
    if(p < 0) return 0;
	while (factorial < 999999999999999 ) {
		factorial = 1;
		for (int i = 1; i <= c; i++) {
			factorial *= i;
		}
		if (nrzero(factorial) == p) {
			fout << factorial;
			gasit = true;
			break;
		}
		c++;
	}
	if (gasit == false) fout << -1;
}