#include<fstream>
using namespace std;
int main()
{long long a,p=0,n,i,j,pb=0;
ifstream f("fact.in");
ofstream g("fact.out");
f>>p;
pb=1;
i=5;
while(pb<p)
{i=i+10;
n=n*i;
j=i;
pb=pb+1;
while(j%5==0)
{j=j/5; pb=pb+1;}}
if(pb==p)
g<<i;
else
g<<-1;
f.close();
g.close();
return 0;}