#include <iostream> using namespace std; int countBits(int n) { int count = 0; while (n) { count += n & 1; n >>= 1; } return count; } int main() { int L, R; cin >> L >> R; int sum = 0; for (int i = L; i <= R; ++i) { sum += countBits(i); } cout << sum << endl; return 0; }