#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int cmmdc(int a,int b)
    {
        while(a!=b)
            if(a>b)
              a=a-b;
            else
              b=b-a;
        return a;
    }
int i,j,n,s=0;
int main()
{
    f>>n;
    for(i=2;i<=n;i++)
        for(j=1;j<=n;j++)
            if(cmmdc(i,j)==1)
              s++;
    g<<s+n;
    return 0;
}