#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream in("fractii.in");
    ofstream out("fractii.out");
    int N,Q,P,k=0,i,j;
    in>>N;
    Q=1;
    P=1;
    for(i=P;i<=N;i++)
    {
        Q=1;
        for(j=Q;j<=N;j++)
        {
            if(i%j!=0)//|| j%i!=0)
                k++;
            Q++;
        }
        P++;
    }
    out<<k;
    return 0;
}