#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");
    int p,q, N,r;
    fin>>N;
    r=0;
    for (p=1; p<N+1; p++){

        for(q=1; q<N+1; q++){
            if (p==1 && q==1){
                r=r+1;
        }
            if (p%q!=0){
                r=r+1;
            }

        }

    }
    fout<<r;
    return 0;
}