#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int N,a,k,i,x,y,r;
int main()
{
    f>>N;
    a=1;
    while(a<=N)
    {
        for(i=1;i<=N;i++)
        {
            x=a;
            y=i;
            r=x%y;
            while(r)
            {
                x=y;
                y=r;
                r=x%y;
            }
            if(y==1)
                k++;
        }
        a++;
    }
    g<<k;
}