#include<cstring>
#include<fstream>
using namespace std;
int n,m,a,b,i,j,nr;
int cmmdc(int a, int b)
{
    int t;
    while (b != 0)
    {
        t = b;
        b = a % b;
        a = t;
    }
    return a;
}
int main()
{
    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;
    return 0;
}