#include <fstream>

using namespace std;

int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    int n,i,j,s,r, x,y;


    f>>n;
    s=2*n-1;
    for(i=2;i<=n;i++)
    {
        for(j=2;j<=n;j++)
        {
            if(i!=j)
            {
                x=i;
                y=j;
                while(x%y)
                {
                    r=x%y;
                    x=y;
                    y=r;

                }
                if (y==1)
                {
                    s=s+1;
                }
            }


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