#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int n, nr;

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

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