#include <bits/stdc++.h>
using namespace std;
int cmmdc(int a, int b)
{
    while(b != 0)
    {
        int r = a % b;
        a = b;
        b = r;
    }
    return a;
}
int n, nr;
ifstream f("fractii.in");
ofstream g("fractii.out");
int main()
{
    f >> n;
    for(int i = 1; i <= n; i++)
    {
        for(int j = 1; j <= n; j++)
        {
            if(cmmdc(j, i) == 1)
            {
                nr++;
            }
        }
    }
    g << nr;
    return 0;
}