#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fact.in");
ofstream g("fact.out");
int n,p;
int main()
{
    f>>p;
    for(int i=1;i<=p;i++)
    {
        n=n+5;
    }
    g<<n;
    f.close();
    g.close();
}