#include <stdio.h>
#include <stdlib.h>
#include <math.h>


int main(int argc, char *argv[])
{
    long n = 0;
    long nr_ = 0;
    long nr = 0;
    long i = 0;
    FILE * f = fopen("fractii.in", "r");
    fscanf(f, "%ld", &n);
    fclose(f);
    nr_ = nr_ + (n / 2) * (n / 2);
    for (i = 3; i <= n ; i = i + 2)
       {
       nr_ = nr_ + (n / i) * ((n / i) - 1) + 1;        
       }
    nr = n * n - nr_ ;
   
    f = fopen("fractii.out", "w");
    fprintf(f, "%ld", nr);
    fclose(f);
    return 0;
}