#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int main()
{
    long n,k=1;
    f >> n;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++)
            if(i > j)
                if(i%j != 0) k++;
            else
                if(j%i != 0)k++;
    g << k;
    return 0;
}