#include <iostream>
#include <fstream>

using namespace std;

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

    long long n, r, a, b;
    f>>n;
    long 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;
}