#include <bits/stdc++.h>
using namespace std;
long long A, B, C, X, Y, Z, a, b, c, need;
int main() {
  cin >> A >> B >> C;
  cin >> X >> Y >> Z;
  a = 0;
  b = 0;
  c = 0;
  need = 0;
  if (A >= X)
    a = A - X;
  else
    need += X - A;
  if (B >= Y)
    b = B - Y;
  else
    need += Y - B;
  if (C >= Z)
    c = C - Z;
  else
    need += Z - C;
  if (!need || (a / 2 + b / 2 + c / 2) >= need)
    cout << "Yes";
  else
    cout << "No";
}
