#include <bits/stdc++.h>

bool debug=true;

#define ll long long
#define ull unsigned long long

#define log(var) if(debug) {cout << #var << ": " << (var) << endl;}
#define tr(container, it) \
	 for(typeof(container.begin() it = container.begin(); it != container.end(); it++)

using namespace std;

ll div_below(ll m){
	ll sum = 0;
	ll try_to = floor(sqrt(m));
	for(ll a = 1; a<=try_to; a++){
		sum += a*((m/a)-(m/(a+1)));	
	}
	for(ll a = 1; a<=m/(try_to+1); a++){
		sum += (m/a);
	}
	return sum;	
}

int main(){
ll n,m;
cin >> n >> m;
cout << div_below(m) - div_below(n-1) << endl;

return 0;
}