#include <iostream>
#include <fstream>
using namespace std;
int a,i,p,k,x;
int main()
{
    ifstream f("fact.in");
    ofstream g("fact.out");
    f >> k;
    a=0;
    while (a<=k)
    {
        for (long long i=1; i<=999999999999; ++i)
        {
            x=i;
            if (x%5==0)
            {
                while (x%5==0)
                {
                    a=a+1;
                    x=x/5;
                }
                if (a==k)
                {
                    p=i;
                    break;
                }
            }
            if (p==i) break;
        }
        if (a==k) g << p;
    }
    return 0;
}