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

ifstream f("date.in");
ofstream g("date.out");
int cmmdc(int a, int b)
{
    int c;
    while (b) {
        c = a % b;
        a = b;
        b = c;
    }
    return a;
}
int main()
{

    int n,s=0,nr1,nr2;
    f>>n;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++)
            if(cmmdc(i,j)==1)
                s++;
    g<<s;

    return 0;
}