#include <fstream>

using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int n,i,nr,j,a,b,r;
int main()
{
    fin>>n;
    nr=n;
    for(i=2;i<=n;i++)
        {nr++;
            for(j=2;j<=n;j++)
            {a=i;b=j;
            r=b%a;
            while(r!=0)
            {
                b=a;
                a=r;
                r=b%a;
            }
             if(a==1)nr++;}
        }
        fout<<nr;
    return 0;
}