#include <iostream>
#include <fstream>
using namespace std;
int n,i,j,r,a,b,nr;
ofstream g("fractii.out");
int main()
{freopen ("fractii.in", "r", stdin);
scanf ("%d", &n);
nr=1;
for (i=1; i<=n-1; i++)
    for (j=i+1; j<=n; j++)
        {a=i;
        b=j;
        r=a%b;
        while (r!=0)
            {a=b;
            b=r;
            r=a%b;}
        r=b;
        if (r==1)
            nr=nr+2;}
g<<nr;

        return 0;
}