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