#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int n,i,k,a,b,c,f;
int main()
{
    fin>>n;
    for(i=2;i<=n;i++)
    for(k=3;k<=n;k++)
    {
        a=i;b=k;
        while(b!=0)
        {
            c=a%b;
            a=b;
            b=c;
        }
        if(a==1)
        f++;

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