#include <fstream>
using namespace std;
ifstream fi("fractii.in");
ofstream fo("fractii.out");
int n ,i,j,k;
int cmmdc( int a,int b)
   { int t;
     while (b !=0)
      {
       t = b;
       b = a % b;
       a = t;}
     return a;}

int main()
{  fi>>n;
 for (i=1;i<=n;i++)
 for (j=1;j<=n;j++)
if (cmmdc(i,j)==1)  k++;
fo<<k;
    return 0;
}