729 B | 729 chars
#include <bits/stdc++.h>
#define for1(s,n) for(int i = s; i < n; i++)
#define for1j(s,n) for(int j = s; j < n; j++)
#define foreach(k) for(auto i : k)
#define foreachj(k) for(auto j : k)
#define pb(a) push_back(a)
#define sz(a) a.size()
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
typedef vector <int> iv1;
typedef vector <vector<int>> iv2;
typedef vector <ll> llv1;
typedef unsigned int uint;
typedef vector <ull> ullv1;
typedef vector <vector <ull>> ullv2;
ll A, B;
ll S;
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin >> A >> B;
ll k = 1;
while(k <= B) {
S += (B/k - (A-1)/k) * (k/2);
k*=2;
}
S+=B-A+1;
cout << S;
}