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

using namespace std;

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

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

      if(p==2)fout<<"10";
                else if(p==10)fout<<"45";
                     else if(p==0)fout<<"1";

    for (i =1;i<=n;i++){
	           p=p*i;

	           while(p){c=p%10;
                              p=p/10;
                              if(c==0)nr++;}
                n=p*5;


      }
            if(nr==p)cout<<n;
                    else fout<<"-1";


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

	return 0;

}