#include <iostream>
#include <fstream>
#define nmax 1000000
using namespace std;

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

int n, i, j, nr=1;
bool v[nmax + 1];

bool cmmdc(int a, int b)
{
    int r;
    while(b)
    {
        r = a%b;
        a = b;
        b = r;
    }
    if(a == 1)
        return true;
    return false;
}

void ciur()
{
    v[1] = v[0] = 1;
     for (i=2; i<=nmax; i++)
        if(v[i] == 0)
           for (j=2*i; j<=nmax; j=j+i)
                   v[j] = 1;

}

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