#include <iostream>
#include <fstream>
using namespace std;
long n,i,j,nr,ii,jj,r;
int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");
    fin>>n;
    nr=0;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
        ii=i;
        jj=j;
        while(jj)
        {
            r=ii%jj;
            ii=jj;
            jj=r;
        }
        if(ii==1)nr++;
        }
    }
    fout<<nr;
    fin.close();
    fout.close();
}