#include <bits/stdc++.h>
#define st first
#define nd second
#define fi first
#define se second
#define pb push_back
#define ps(v) cout << v << " "
#define pln(v) cout << v << "\n"
#define entr cout << "\n"

using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> pll;


ll f(ll x) {
	if (x <= 1) {
		return x;
	}
	ll ans = 0;
	for (ll i = 1; x / i > i; i++) {
		ans += x/i;
	}
	//cout << " " << x << " " << (ll) sqrt(x) << " " << ans <<endl;
	for (ll xi = sqrt(x); xi >= 1; xi--) {
		ans += ((x / xi) - ((x ) / (xi + 1))) * xi;
		//cout << " " << ans <<endl;
	}
	return ans;
}


int main() {
	ios_base::sync_with_stdio(0);
	ll n, m;
	cin >> n >> m;
	ll ans = f(m) - f(n-1);
	cout << ans <<endl;
	return 0;
}