#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");

int cmmdc(int a,int b)
{
    while(a!=b)
        if(a>b)a=a-b;
        else b=b-a;
    return a;
}
int main()
{
    int n,s=0;
    f>>n;
    for(int i=1; i<=n; i++)
        for(int j=1; j<=n; j++)
            if(cmmdc(i,j)==1)s++;
    g<<s;
}