#include <fstream>

using namespace std;

int main()
{
    int P,Q, i = 0, N;
    FILE* fin = fopen("fractii.in","r");
    FILE* fout = fopen("fractii.out","w");
    fscanf(fin, "%d", &N);
    for(P = 1; P <= N; P++)
    {
        for(Q = 1; Q <= N; Q++)
        {
            if(P == 1 || Q == 1)
            {
                i++;
            }
            else if(P % Q != 0 && Q % P != 0)
            {
                i++;
            }
        }
    }
    fprintf(fout, "%d", i);
    fcloseall();
    return 0;
}