#include <bits/stdc++.h>
using namespace std;
 
long long  count(long long  x, int i) {
    long long  step = 1ll  << (i+1); 
    long long  from = 1ll  << i;     
    if (x < from) return 0;
    long long  res = (x - from) / step + 1;
    return res;
}
 
int main() {
    long long  L, R;
    cin >> L >> R;
    long long  ans = 0;
    for(int i=1; (1ll <<i)<=R; i++) { 
        long long  cntR = count(R, i);
        long long  cntL = count(L-1, i);
        ans += (cntR - cntL) * i;
    }
    cout << ans;
    return 0;
}
 

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