#include<bits/stdc++.h>
using namespace std;
int main()
{
	ifstream fin("fact.in.txt");
	ofstream fout("fact.out");
	unsigned long long n,a;
	int p,k=0,i=1;
	fin>>p;n=1;
	while(k!=p||n<=100000000000000000)
	{
		n=n*i;
		i++;a=n;
		for(int k1=1;k1<=p;k1++)
			if(a%10==0)
			{
				k++;
				a=a/10;
			}
			else
			    break;
		if(k==p)
		{
			fout<<n;
			break;
		}
		if(n>=100000000000000000)fout<<"-1";
	}
}