#include <fstream>

using namespace std;

ifstream inFile("fractii.in");
ofstream outFile("fractii.out");

int gcd(int a, int b)
{
    if( a%b == 0) return b;
    else return gcd(b, a%b);
}

int main()
{
    int n;
    inFile >> n;

    int ct = 0;
    for(int i = 1; i <= n; i++){
        for(int j=1; j<=n; j++){
            if(i == 1  &&  j == 1) ct++;
            else{
                if(gcd(i, j) == 1) ct++;
            }
        }
    }

    outFile << ct;
}