#include <iostream>
#include <fstream>

using namespace std;
int n;
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()
{

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


    return 0;
}