#include <iostream>
#include <fstream>

using namespace std;
ifstream f("fractii.in");
ofstream l("fractii.out");
int ireductibil(int a,int b)
{
    if (a%b!=0 or b%a!=0)
    {
        while (a!=b)
        {
            if (a>b)
                a=a-b;
            if (b>a)
                b=b-a;
        }
    }
    if (a==1)
        return 1;
    else
        return 0;
}
int a,b,n,i,j,nr,p[1000001];

int main()
{
    for (i=2; i<=1000001; i++)
    {
        if (p[i]==0)
        {
            for (j=i+i; j<=n; j+=i)
                p[j]=1;
        }
    }
    p[1]=1;
    f>>n;
    for (a=1; a<=n; a++)
    {
        for (b=1; b<=n; b++)
        {
            if (p[a]==0 or p[b]==0)
            {
                nr++;
            }
            else
                if (ireductibil(a,b)==1)
                {
                    nr++;
                    //cout<<a<<"/"<<b<<"\n";
                }
        }
    }
    l<<nr;
    return 0;
}