#include <fstream>
#include <cmath>
using namespace std;
ifstream in("fact.in");
ofstream out("fact.out");
int p,x=5,y,zerouri;
int main()
{
    in>>p;
    if (!p)
        out<<1<<"\n";
    else
    {
        while (1)
        {
            y=x;
            while (x%5==0) x=x/5,zerouri++;
            if (zerouri>=p)
            {
                out<<y<<"\n";
                return 0;
            }
            x=y+5;
        }
    }
}