#include <bits/stdc++.h>
using namespace std;
template <typename T>
ostream& operator<<(ostream& out, vector<T>& v) {
  for (auto a : v) out << a << " ";
  return out;
}
template <typename T>
istream& operator>>(istream& in, vector<T>& v) {
  for (auto& a : v) in >> a;
  return in;
}
template <typename T>
ostream& operator<<(ostream& out, multiset<T>& S) {
  for (auto a : S) out << a << " ";
  return out;
}
template <typename T>
ostream& operator<<(ostream& out, set<T>& S) {
  for (auto a : S) out << a << " ";
  return out;
}
template <typename T>
set<T> operator+(set<T> A, set<T> B) {
  for (auto b : B) A.insert(b);
  return A;
}
int get_score(int p, int t) { return max(75 * p, 250 * p - p * t); }
int main() {
  vector<int> A(3), B(3);
  cin >> A >> B;
  int provide = 0;
  int consume = 0;
  for (int i = 0; i < 3; i++) {
    if (A[i] > B[i]) {
      provide += (A[i] - B[i]) / 2;
    } else if (A[i] < B[i]) {
      consume += B[i] - A[i];
    }
  }
  if (provide >= consume) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
  return 0;
}
