#include <iostream>
#include <fstream>

using namespace std;

int N;
int M;

int cmmdc(int a, int b){
    int c = 0;
    do{
        c = a % b;
        a = b;
        b = c;
    }while( b != 0);
    return a;
}

int main()
{
    M = 0;
    ifstream fin ("fractii.in");
    fin >> N;
    fin.close();

    for(int i = 1; i <= N; i++)
        for(int j = 1; j <= N; j++)
            if(cmmdc(i,j) == 1) M++;

    ofstream fout ("fractii.out");

    fout << M;
    fout.close();

    return 0;
}