#include <iostream>
#include <fstream>

using namespace std;

int cmmdc(int a, int b)
{
    while (a!=b)
    {
        if(a>b)
            a=a-b;
        else
            b=b-a;
    }
    return a;
}

int main()
{
    int i,j,nrFractii=0,n;
    fstream f ("fractii.in", ios::in);
    fstream g ("fractii.out", ios::out);
    f>>n;
    for(i=1; i<=n; i++)
        for(j=1;j<=n;j++)
        {
            if(cmmdc(i,j)==1)
                nrFractii++;
        }
    g<<nrFractii;
    f.close();
    g.close();
}