#include <iostream>
#include <fstream>
using namespace std;

int cmmdc(int x, int y)
{
    if (!y) return x;

    return cmmdc(y, x % y);
}

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

    int n, nr, x, y;

    f >> n;

    nr = n;
    for(int x=2; x<=n; x++) {
        nr++;
        for(int y=2; y<=n; y++)
            if(cmmdc(x, y) == 1)
                nr++;
    }

    g << nr;

    f.close();
    g.close();
    return 0;
}