#include <fstream>

using namespace std;

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

int cmmdc(int a, int b){
    int r;
    while(b){
        r = a % b;
        a = b;
        b = r;
    }
    return a;
}

int main(){
    int n, i, j, c=0;
    fin >> n;
    for(i=1;i<=n;i++){
        for(j=1;j<=n;j++){
            if(cmmdc(i, j) == 1)c++;
        }
    }
    fout << c;
    fin.close();
    fout.close();
}