#include <iostream>
#include <fstream>
using namespace std;
int ireduct(int x, int y)
{
    int t,a,b;
    a=x;
    b=y;
    while (b != 0)
    {
        t = b;
        b = a % b;
        a = t;
    }
    if(a==1)
        return 0;
    else
        return a;
}
int main()
{
    int i,j,n,nr=0;
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    f>>n;
    for(i=1; i<=n; i++)
    {
        for(j=1; j<=n; j++)

            if(ireduct(i,j)==0)
                nr++;
    }

    g<<nr;
    return 0;
}