#include <iostream>
#include <fstream>

using namespace std;

bool ireduct(int a, int b){
    int r;
    while(b){
        r = a % b;
        a = b;
        b = r;
    }
    return (a == 1);
}

int main(){
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    int n, c = 0;
    f >> n;
    for(int i = 2; i <= n; i++){
        for(int j = 2; j <= n; j++){
            if(ireduct(i, j))
                c++;
        }
    }
    c += n * 2 - 1;
    g << c << endl;
    f.close();
    g.close();
    return 0;
}