#include <bits/stdc++.h>

using namespace std;

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

int cmmdc(int a, int b){
    if(b == 0)
        return a;

    return cmmdc(b, a%b);
}

int main(){
    int n, c = 0;

    cin >> n;

    for(int i = 1; i<=n; i++){
        for(int j = 1; j<=n; j++){
            if(cmmdc(i, j) == 1){
                c++;
            }
        }
    }

    cout << c;

    return 0;
}