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

int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");

    int n, app=0;
    fin >> n;

    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
        {
            int a=i, b=j, r;
            while(b)
            {
                r=a%b;
                a=b;
                b=r;
            }
            if(a==1) app++;
        }
    }

    fout << app;
    return 0;
}