#include <iostream>
#include <fstream>

using namespace std;

int cmmdc(int a, int b)
{
    int r;
    if(a<b)
    {
        r=a;
        a=b;
        b=r;
    }
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    if(a==1) return 0;
    return a;
}

int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");
    int n,rez=0;
    fin>>n;
    for(int i=1; i<=n; i++)
        for(int j=1; j<=n; j++)
            if(cmmdc(i,j)==0)
                rez++;
    fout << rez << endl;
    return 0;
}