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