#include <fstream>
using namespace std;

int main() {
    ifstream fin("fact.in");
    ofstream fout("fact.out");
    long long int p,i,n,j,y;
    fin>>p;
    n=0;
    y=0;
    i=0;
    while (y<p)
    {
        i+=5;
        j=i;
        n=j;
        while (j%5==0)
        {
            y++;
            j/=5;
        }
    }
    if (y==p) fout<<n;
    else fout<<"-1";
    return 0;
}