#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;

int main(){
ll n,m,sum;
cin >> n >> m;

sum = m-n+1;

for(ll i = 2; i<=m;i++){
 sum += (m/i) - ((n-1)/i);
}

cout << sum << endl;

return 0;
}