#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    int n,i,j,r,k,a,b;
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    f>>n;
    f.close();
    k=n*2-1;
    for(i=2;i<=n;i++)
        for(j=2;j<=n;j++)
        {
            a=i; b=j;
            while(b)
            {
                r=a%b;
                a=b;
                b=r;
            }
            if(a==1)
                k++;
        }
    g<<k<<endl;
    g.close();
    return 0;
}