#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int cmmdc(int a,int b)
{
    while(a!=b)
        if(a>b)
         a=a-b;
      else
        b=b-a;
      return a;
}
int main()
{
    int i,j,n,s=0;
    fin>>n;
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
         if(cmmdc(i,j)==1)
         s++;
    fout<<s;
    return 0;
}