#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream in("fact.in");
    ofstream out("fact.out");

    long int numar;
    in>>numar;
     long int fact;

    fact = numar*5;
    if(fact==0){ out<<1;}
    else
    out<<fact-5;

    return 0;
}