BSBB.cpp

#include <bits/stdc++.h>
using namespace std;

#define taskname "BSBB"

typedef long long ll;

const int N = 1000001;

int cnt[N];

int main() {
  for (int i = 1; i < N; i++)
  for (int j = i; j < N; j += i) {
    cnt[j]++;
  }
  int n; cin >> n;
  ll ans = 0;
  for (int i = 1; i < n; i++) {
    ans += cnt[i];
  }
  cout << ans << '\n';
}