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

ifstream f("fractii.in");
ofstream g("fractii.out");

int cmmdc(int a, int b)
{
    int r;
    while(b!=0)
    {
        r = a%b;
        a = b;
        b = r;
    }
    return a;
}

int main()
{
    int n,s=0;
    f >> n;
    for(int i = 1; i<=n; i++)
    {
        for(int j = 1; j<=n; j++)
        {
            if (cmmdc(i,j) == 1) s++;
        }
    }
    g << s;
    return 0;
}