#include <iostream>
#include <fstream>
using namespace std;

ifstream fin("fractii.in");
ofstream fout("fractii.out");

int N, fractii = 0;

int cmmdc(int a, int b) {
    if(!b)
        return a;
    return cmmdc(b, a%b);
}

int main() {
    fin>>N;
    for(int i = 1; i <= N; i++) {
        for(int j = 1; j <= N; j++) {
            if(cmmdc(i, j) == 1)
                fractii++;
        }
    }
    fout<<fractii;
    return 0;
}