#include <fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int cmmdc(int a, int b)
{
    int r;
    while(b!=0)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    int a, b, n, ct=0;
    fin>>n;
    for(a=1;a<=n;a++)
        for(b=1;b<=n;b++)
            if(cmmdc(a, b)==1)
                ct++;
    fout<<ct;
    return 0;
}