#include <iostream>
#include <fstream>

using namespace std;

short maxim(short n)
{
    short f=n*5-5;
    if(f<=0)
        return 1;
    else
        return f;
}
int main()
{
    short P;
    ifstream f("fact.in");
    ofstream g("fact.out");
    f>>P;
    g<<maxim(P);
    f.close();
    g.close();
}