#include<iostream.h>
#include<fstream.h>

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

long p, s;

void citire()
{
     f>>p;
     f.close();
}

main()
{
      citire();
      if(p==0) g<<'1';
      else 
      {
           long long numar;
           int r;
           r=p%6;
           s=p/6;
           numar=25*s + r*5;
           g<<numar;
           }
      g.close();
}