#include <iostream>
#include <fstream>

using namespace std;
ifstream f("fractii.in");
ofstream l("fractii.out");
int ireductibil(int a,int b)
{
    int r;
    if (a%b!=0 or b%a!=0)
    {
        while (a%b!=0)
        {
            r=a%b;
            a=b;
            b=r;
        }
    }
    if (b==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;
    nr=n;
    for (a=2; a<=n; a++)
    {
        for (b=1; b<=n; b++)
        {
            if (ireductibil(a,b)==1)
            {
                nr++;
                //cout<<a<<"/"<<b<<"\n";
            }
        }
    }
    l<<nr;
    return 0;
}