#include<iostream>
#include<cmath>
#include<fstream>

using namespace std;

ifstream fin("fact.in");
ofstream fout("fact.out");

int main () {
    int n,i,p=1,c,nr=1;
      fin >> p;
      for (i =1;i<=n;i++){
	           p=p*i;

	           while(p){c=p%10;
	                               p=p/10;
	                                if(c==0)nr++;}
      }
                if(nr==p)cout<<p*5;
                    else fout<<"-1";

    fin.close();
	fout.close();

	return 0;

}