#include <iostream>
#include <fstream>

using namespace std;

 long long int n,nr;
 int ok;

int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");

    fin>>n;
    nr=n+(n-1);
    for (int i=2;i<=n;i++)
        for (int j=2;j<=n;j++)
        {
            ok=1;
            if (i==j)
                ok=0;
            if (i%2==0 && j%2==0)
                ok=0;
            for (int d=3;d<=n;d=d+2)
                if (i%d==0 && j%d==0)
                    ok=0;
            if (i%j==0)
                ok=0;
            if (j%i==0)
                ok=0;
            if(ok==1)
                nr++;
        }
    fout<<nr;

    fin.close();
    fout.close();
    return 0;
}