#include<iostream>
#include<fstream>
using namespace std;
int cmmdc(int a,int b)
{
    int r=a%b;
    while (r)
    {
        a=b;
        b=r;
        r=a%b;
    }
    return b;
}
int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");
    int n;
    fin>>n;
    int ct=0;
    for (int i=1; i<=n; i++)
    {
        if (i%2==0)
        {

            for (int j=1; j<n;)
            {
                int x=cmmdc(i,j);
                if (x==1)
                    ct++;
                j=j+2;
            }
        }
    }
    fout<<ct;
}