#include <bits/stdc++.h>

std::ifstream cin("fractii.in");
std::ofstream cout("fractii.out");

int main(){
    int n, a;
    cin>>n;
    a = 0;
    for(int i = 1; i<=n; i++){
        for(int j = 1; j<=n; j++){
            if(std::__gcd(i, j) == 1){
                a++;
            }
        }
    }
    cout<<a;
}