#include <algorithm>
#include <iostream>
#include <fstream>
using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
int main()
{
    int n;
    in>>n;
    int nr=0;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
        {
            if(__gcd(i,j)==1)
                nr++;
        }
    }
    out<<nr;
    return 0;
}