#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("fractii.in");
ofstream fout ("fractii.out");
int euclid(int a, int b)
{
    int c;
    while (b)
    {
        c=a%b;
        a=b;
        b=c;
    }
    return a;
}
int main()
{
    int N;
    fin>>N;
    int a=1, b=1;
    int c=0;
    for (int a=1; a<=N; a++)
    {
        for (int b=1; b<=N; b++)
        {
            if (a==b&&b==1)
            {
                c++;
            }
            else if(euclid(a, b)==1)
            {
                c++;
            }
        }
    }
    fout<<c;
    return 0;
}