#include <fstream> 
using namespace std; 
int main() 
{  
    long long  p,i,cif,X;
    ifstream cin("fact.in");
    ofstream cout("fact.out");
    cin>>p;
    
    for(i=5;cif<p;i+=5)
    {        
             X=i;        
             while (X%5==0)        
             X/=5;       
             cif++; 
             } 
     if (p==0)
     cout<<1;   
     else  
     cif==p;
     cout<<i-5;cout<<-1; 
     
     cin.close();    
     cout.close();    
     return 0; 
}