#include <iostream>
#include <fstream>
using namespace std;
int k,n,p;
int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    f >> n;
    k=n;
    for(int i=2;i<=n;++i)
    {
        k=k+1;
        for (int j=2;j<=n;++j)
        {
            p=1;
            for (int o=2;o<=i;++o)
                if (j%o==0 && i%o==0) p=0;
            if (p==1) k=k+1;
        }
    }
    g << k;
    return 0;
}