#include <iostream>
#include <math.h>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");

int main()
{
long long int n,i,j,counter=0;

cin>>n;

for (i=1;i<=n;i++){
    for (j=1;j<=n;j++){
       if (i==1 || j==1)
        counter++;
       else if (max(i,j)%min(i,j)!=0)
        counter++;

    }
}
/// 1/1 1/2 1/3 1/4 1/5 2/1 2/3 2/5 3/1 3/2 3/4 3/5 4/1 4/3 4/5 5/1 5/2 5/3 5/4


cout<<counter;


     return 0;
}