#include <iostream>
#include<fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int n,nr;

int cmmdc (int a,int b)
{
    while(a!=b)
    {
        if(a>b)
            a=a-b;
        else b=b-a;
    }
    return a;
}
int main ()
{
    f>>n;
    for(int i=1; i<=n; i++)
        for(int j=1; j<=n; j++)
            if(cmmdc(i,j)==1)
                nr++;
    g<<nr;
    f.close();
    return 0;
}