#include <fstream>
using namespace std;
ifstream cin("fractii.in");
ofstream cout("fractii.out");
int n;

int f(int a,int b)
{
    if (a%b==0)
        return b;
    return
        f(b,a%b);
}

int main()
{
    cin>>n;
    long long ans=n*n;
    for (int i=1;i<=n;i++)
        for (int j=1;j<=n;j++)
            if (f(i,j)!=1)
               ans--;
    cout<<ans;
    return 0;
}