#include <fstream>
using namespace std;

int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");

    long N, r, a, b;
    f >> N;
    long s=N;

    for (long i=2; i<=N; i++)
    {
        for (long j=1; j<=N; j++)
        {
            r=i%j;
            a=i;
            b=j;
            while (r!=0)
            {
                a=b;
                b=r;
                r=a%b;
            }
            if (b==1)
                s++;
        }
    }

    g << s;
}