#include <iostream>
#include <fstream>
#include <cstring>
#include <string>
#include <climits>
#include <algorithm>
#include <cmath>
using namespace std;



ifstream fin ("fractii.in");
ofstream fout("fractii.out");
#define MAX 6000004

long long int i,n,u=0,l=0,j;


long long int cmmdc(int a, int b)
{
    int r=a%b;
    while(r)
    {
        a=b;
        b=r;
        r=a%b;
    }
    return b;
}

int main()
{
    fin>>n;
    long long int s=0;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            if(cmmdc(i,j)==1)
            {
                s++;
            }
        }
    }
    fout<<s;

    return 0;
}