#include <fstream>
using namespace std;

int main()
{   long long a,b,S,i,j,n;
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    f>>n;
    long long V[n];
    for(i=1;i<=n;i++)
        V[i]=i;
    S=2*n-1;
    for(i=2;i<=n;i++)
        for(j=2;j<=n;j++)
            {a=V[i];b=V[j];
            while(a!=b)
                if(a>b)
                    a=a-b;
                else
                    b=b-a;
            if(a==1)
                S++;}
    g<<S;
    g<<"\n";
    return 0;
}