#include <iostream>
#include <fstream>

using namespace std;

ifstream fcin("fractii.in");
ofstream fcout("fractii.out");

int i,j,r;

int prime(int a,int b){
    r=a%b;
    while(r>0){
        a=b;
        b=r;
        r=a%b;
    }
    if(b==1) return 1;
    else return 0;
}

int main()
{
    int x,nr=0;
    fcin>>x;
    nr+=x;
    for(i=2;i<=x;i++){
        nr+=1;
        for(j=2;j<=x;j++){
            if(j!=i){
            if(prime(i,j)==1)
                nr++;
            }
        }
    }
    fcout<<nr;
    return 0;
}