#include <fstream>

using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int n;
int cmmdc(int a,int b)
{int r;
    while(b)
           {
               r=a%b;
               a=b;
               b=r;
           }
           return a;
}
int main()
{
    int i,j,ok=0;
    f>>n;
    for(i=1;i<=n;i++)
       for(j=1;j<=n;j++)
           if(cmmdc(i,j)==1)ok++;
       g<<ok;
    f.close();
    g.close();
    return 0;
}