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