#ifndef LOCAL
#pragma GCC optimize("O3")
#endif
#include <bits/stdc++.h>
using namespace std;

#define sim template < class c
#define ris return * this
#define mor > muu & operator << (
#define R22(r) sim > typename \
  enable_if<1 r sizeof dud<c>(0), muu&>::type operator<<( c g) {
sim > struct rge { c b, e; };
sim > rge<c> range(c h, c n) { return {h, n}; }
sim > auto dud(c * r) -> decltype(cerr << *r);
sim > char dud(...);
struct muu {
	#ifdef LOCAL
	stringstream a;
	~muu() { cerr << a.str() << endl; }
	R22(<) a << boolalpha << g; ris; }
	R22(==) ris << range(begin(g), end(g)); }
	sim, class b mor pair < b, c> r) { ris << "(" << r.first << ", " << r.second << ")"; }
	sim mor rge<c> u) {
		a << "[";
		for (c i = u.b; i != u.e; ++i) 
			*this << ", " + 2 * (i == u.b) << *i;
		ris << "]";
	}
#else
sim mor const c&) { ris; }
#endif
muu & operator()() { ris; }
};
#define imie(r...) "[" #r ": " << (r) << "] "
#define debug (muu() << __FUNCTION__ << "#" << __LINE__ << ": ")

long long licz(long long b) {
	if (b == 0) return 0;
	
	long long res = 0;
	for (long long d = 1; d * d <= b; ++d) {
		long long pom = (b / d) - d;
		res += 2 * pom;
		
		if (d * d <= b) res++;
	}
	return res;
}

int main() {
	ios_base::sync_with_stdio(0);
	long long n, m;
	cin >> n >> m;
	long long res = licz(m) - licz(n - 1);
	cout << res << endl;
	return 0;
}