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


int cmmdc(int a,int b)
{int r;
 while(b!=0){
    r=a%b;
    a=b;
    b=r;
 }
 return a;
}

int main()
{
    int N,i,j,nr=0;
    fin>>N;
    for(i=1;i<=N;i++)
        for(j=1;j<=N;j++)
            if(cmmdc(i,j)==1)
                nr++;
    fout<<nr;
    fin.close();
    fout.close();
    return 0;
}