#include <iostream>
#include <fstream>
using namespace std;
int euclid(int i, int j){
    int r, a, b;
    a=i; b=j;
    while (b){
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main(){
int n, i, j, fr=0;
ifstream f("fractii.in");
ofstream g("fractii.out");
f>>n;
for (i=1; i<=n; i++)
    for (j=1; j<=n; j++){
        if (euclid(i,j)==1) fr++;
    }
cout<<fr;
return 0;
f.close();
g.close();
}