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

long long query(long long x) {
	const long long s = sqrt(x);
	long long ret = 0;
	for (long long i = 1; i <= s; ++i)
		ret += x / i;
	long long j = s + 1;
	while (j <= x) {
		const long long k = x / j;
		const long long j0 = x / k + 1;
		ret += (j0 - j) * k;
		j = j0;
	}
	return ret;
}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	long long n,m;
	cin >> n >> m;
	cout << query(m) - query(n - 1) << '\n';
}