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

int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    int n;
    f>>n;
    int i,j,t=n*2-1,k;
    bool c;
    for (i=2;i<=n;i++)
    {
        for (j=2;j<=n;j++)
        {
            if (i!=j)
            {
                c=true;
                k=2;
                while (c&&k<=min(i,j))
                {
                    if (i%k==0&&j%k==0) c=false;
                    else k++;
                }
                if (c) t++;
            }
        }
    }
    g<<t;
    g.close();
    f.close();
    return 0;
}