#include <fstream>
using namespace std;
ifstream cin("fractii.in");
ofstream cout("fractii.out");
int N;
unsigned long long cnt;
int cmmdc(int a, int b)
{
    int r;
    do
    {
        r=a%b;
        a=b;
        b=r;
    }while(b);
    return a;
}
int main()
{
    cin>>N;
    for(int a=1;a<=N;a++)
        for(int b=1;b<=N;b++)
        if(cmmdc(a,b)==1) ++cnt;
    cout<<cnt;
}