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