#include <iostream>
#include <fstream>
using namespace std;

int cmmdc(int x, int y);


int main()
{
    ifstream in("fractii.in");
    ofstream out("fractii.out");
    int n, i, j, z=0;
    in>>n;

    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++){
            if(cmmdc(i,j)==1)
                z++;
        }



    out<<z;
    in.close();
    out.close();
    return 0;


}

int cmmdc(int x, int y){
    if((!x)||!(y)) return x+y;
    if(x>y) return cmmdc(x%y,y);
    return cmmdc(x,y%x);
}