#include <iostream>
#include <cmath>
#include <fstream>
using namespace std;

int main()
{
    ifstream cin("fractii.in");
    ofstream cout("fractii.out");
    int n;
    long long cnt;
    cin>>n;
    cnt=n;
    for(int i=2;i<=n;i++)
    {
        cnt++;
        for(int j=2;j<=n;j++)
        {
        if(max(i,j)%min(j,i)!=0)
            cnt++;
        }
    }
    cout<<cnt;
    return 0;
}