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