#include <bits/stdc++.h>

using namespace std;

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

int Cmmdc(int a, int b)
{
    while(a != b)
    {
        if(a > b) a = a - b;
        else b = b - a;
    }
    return a;
}

int main()
{
    int n, i, j, nr = 0;
    fin >> n;
    for(i = 1; i <= n; i++)
        for(j = 1; j <= n ; j++)
        if(Cmmdc(i, j) == 1) nr++;
    fout << nr;
    fout.close();
    return 0;
}