#include <bits/stdc++.h>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int n, i, j, nr;
int cmmdc(int a, int b)
{
    if(b) return cmmdc(b, a % b);
    return a;
}
int main()
{
    f >> n;
    for(i = 1;i <= n;i++)
        for(j = 1;j <= n;j++)
        {
            if(cmmdc(i, j) == 1) nr++;
        }
    g << nr;
}