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

int cmmdc(int a,int b){
    while(a!=b)
        if(a>b)a-=b;
        else b-=a;
    return b;
}

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