#include <bits/stdc++.h>

using namespace std;

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

int main()
{
    int p,nr=0;
    long long n=0,n1;
    in>>p;
    while(nr<p)
    {
        n=n+5;
        n1=n;
        while(n1%5==0)
        {
            nr++;
            n1=n1/5;
        }
    }
    if(p==0)
        out<<"1";
    else
    {
        if(nr==p)
            out<<n;
        else
            out<<"-1";
    }
    return 0;
}