#include <fstream>

using namespace std;
ifstream cin("fact.in");
ofstream cout("fact.out");
int main()
{
    int n,c=0,ci,p;
    cin>>p;
    if(p==0)
    {
        cout<<1;
        return 0;
    }
    for(int i=5;ci=i;i+=5)
        while(ci%5==0){
            ci/=5;c++;if(c==p){
                        cout<<i;
                        return 0;
                              }
            if(c>p){
                cout<<-1;
                return 0;;
                   }
                      }

    return 0;
}