#include <stdio.h>
long  q,i,n,s;
FILE *f;
int main(void){
 f = fopen("fractii.in", "rt");
 fscanf(f, "%d", &n);
 s=1;
 for(i=2;i<=n;i++){
  q=1;
  while(q<i){
  while(q % i!=0){ s++;}
  q++;}   }
 fclose(f);
 f = fopen("fractii.out", "wt");
 fprintf(f, "%d", s);
 fclose(f);
 return 0;
 }