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

constexpr ll nax = 1e12;

ll n, m;

ll solve(const ll v)
{
    if (v == 0) return 0ll;

    ll res = 0;

    ll i = 1;
    for (; i * i <= v; ++i)
        res += v / i;

    --i;

    ll pop = i;

    if (i * i == v) --i;

    for (ll j = i; j >= 1; --j)
    {
        ll d = v / j;
        res += max(0ll, (d - pop)) * j;
        pop = d;
    }

    return res;
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> n >> m;

    cout << solve(m) - solve(n - 1) << '\n';
}