#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
ifstream in("fact.in");
ofstream out("fact.out");


int copie,p,finish;
int main()
{
    in >> p; copie = p;

    if( p == 0 ) { out << 1 ; return 0 ; }

    while( p ) { finish += 5 ; p-- ; }

    if ( copie >= 5 ) finish -= 5 ;

    out << finish ;

    return 0;
}