#include <iostream>
#include <fstream>
using namespace std;

int euclid(int a, int b)
{
    int c;
    while (b) {
        c = a % b;
        a = b;
        b = c;
    }
    return a;
}

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

int main()
{
    int n,fractii=0;
    in >>n;
    for (int i=1;i<=n;i++)
    for (int j=1;j<=n;j++){
        if (euclid(i,j)==1){
            fractii++;
        }
    }
    out <<fractii;

}