#include <iostream>
#include <fstream>
using namespace std;
ifstream in("fractii.in	");
ofstream out("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 a;
    in>>a;
    int c=0;
    for(int i=1;i<=a;i++)
    {
        for(int j=1;j<=a;j++)
        {
            if(cmmdc(i,j)==1){
                c++;}
        }
    }

    out<<c;

    return 0;
}