#include <stdio.h>

int main()
{
  FILE *f1, *f2;
  f1 = fopen("fractii.in", "r");
  f2 = fopen("fractii.out", "w");
  int n, i, j, k = 0;
  fscanf(f1, "%d", &n);
  for (i=1;i<=n;i++)
    for (j=1;j<=n;j++)
    if (i/j*j == i) k++;
  fprintf(f2, "%d", n*n-k-1);
  fclose(f2);
  return 0;
}