#include <iostream>
#include <fstream>
using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
int CMMDC(int a,int b)
{
    if(b==1)
        return 1;
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    int n,nr=0;
    in>>n;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++)
        {
   if(CMMDC(i, j) == 1)
       nr++;
        }
    
    out<<nr;
    return 0;
}