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

ll f(ll n){
    if (n == 0)
        return 0;
    if (n == 1)
        return 1;
    ll ans = 0;
    ll nxt = 0;
    for (ll i = 1; i * i <= n; i++){
        ans += n/i;
        nxt = i+1;
    }
    for (ll d = n/nxt; d >= 1; d--){
        ll nwnxt = min(n+1, n/d);
        ans += (nwnxt-nxt+1)*d;
        nxt = nwnxt+1;
    }
    return ans;
}

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    ll L, R;
    cin >> L >> R;
    cout << f(R)-f(L-1);

}