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

    f=2*f+2*n-1;
    fout<<f;
    fin.close();
    fout.close();
    return 0;
}