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

typedef long long ll;
typedef double lf;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;

#define TRACE(x) cerr << #x << ' ' << x << endl
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define REP(i, n) FOR(i, 0, n)
#define _ << ' ' <<

#define fi first
#define sec second
#define se second
#define mp make_pair
#define pb push_back

ll get(ll x, ll lo, ll hi) {
  ll poc = x * x + x;
  if(poc > hi) return 0;
  poc = max(poc, lo);
  if(poc % x) {
    poc -= poc % x;
    poc += x;
  }
  if(poc > hi) return 0;
  ll vel = hi - poc + 1;
  return (vel - 1) / x + 1;
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  ll lo, hi; cin >> lo >> hi;

  ll sol = (hi - lo + 1) * 2;
  if(lo == 1) sol --;
  FOR(i, 2, 1e6 + 5) {
    ll x = i;
    if(x * x >= lo && x * x <= hi) sol ++;
    sol += get(x, lo, hi) * 2;
  }
  cout << sol << endl;
  return 0;
}