#include <iostream>
#include <fstream>
using namespace std;
int verificare(int i, int j)
{
   int d;
   if(i==j) return 0;
   for(d=2;d<i*j/2;d++)
   {
       if(i%d==0 && j%d==0) return 0;
   }
    return 1;
}
int main()
{
    ifstream in("fractii.in");
    ofstream out("fractii.out");
    int i,j,n,s;
    in>>n;
    s=n;
    for(i=2;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            if(verificare(i,j)==1) s++;
        }
    }
    out<<s;
    return 0;
}