#include <fstream>
using namespace std;
fstream fin("fractii.in",ios::in);
fstream fout("fractii.out",ios::out);

int n;

bool cmmdc(int a,int b){
    while(b){
        int r = a%b;
        a = b;
        b = r;
    }
    if(a == 1)
        return false;
    return true;
}

unsigned long  rezolv(){
    long long  number = 0;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++)
        if(cmmdc(i,j) == false)
        number++;
    return number;
}
int main()
{
    fin >> n;
   fout << rezolv();
    return 0;
}