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

ll n, m;

ll p (ll n) {
	if (!n) return 0;
	ll ptr = 1, ans = 0;
	
	while (ptr != n + 1) {
		ll d = n / ptr;
		ll next = n / d + 1;
		ans += (next - ptr) * (n / ptr);
		ptr = next;
	}
	return ans;
}

int main () {
	cin >> n >> m;

	
	cout << p (m) - p (n - 1);
}