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