#include <iostream>
#include <fstream>

using namespace std;

int cmmdc(int x,int y)
{
    while(x!=y)
        if(x>y)
            x=x-y;
        else
            y=y-x;
    return x;
}

int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");
    long int N,P,Q;
    int s=0;
    fin>>N;
    for(P=1;P<=N;P++)
        for(Q=1;Q<=N;Q++)
            if(cmmdc(P,Q)==1)
                s++;
    fout<<s;
    fin.close();
    fout.close();
}