#include <fstream>

using namespace std;
int cmmdc(int a, int b)
{
    while (a!=b)
    {
        if (a>b) a-=b;
        else b-=a;
    }
    return a;
}
int main()
{
    int nr=0,n,i,j;
    ifstream f("fractii.in");
    ofstream g("fractii.out");

    f>>n;
    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;
}