#include <bits/stdc++.h>
int A[6], n, i;
int main() {
  for (int& x : A) std::cin >> x;
  for (; i < 3; ++i) n += (A[i] - A[i + 3]) / (1 + (A[i] > A[i + 3]));
  std::cout << (n < 0 ? "No" : "Yes");
}
