#include <fstream>
using namespace std;
ifstream f("fact.in");
ofstream g("fact.out");
unsigned long long p;
long long n,cn;
int k;
int main()
{
    f>>p;
    if(p==0)
        g<<1<<'\n';
    else{
        n=5;
        while(p>0){
            cn=n;
            k=0;
            while(cn%5==0){
                p--;
                k++;
                cn/=5;
            }
            if(p==0)
                break;
            n+=5;
        }
        g<<n<<' ';
    }
    return 0;
}