#include <bits/stdc++.h>
using namespace std;
int a, b, c;
int x, y, z;
int main() {
  cin >> a >> b >> c;
  cin >> x >> y >> z;
  int k = min(a, x);
  a -= k;
  x -= k;
  k = min(b, y);
  b -= k;
  y -= k;
  k = min(c, z);
  c -= k;
  z -= k;
  int sum = a / 2 + b / 2 + c / 2;
  if ((x == 0 && y == 0 && z == 0) || (sum >= x + y + z))
    cout << "Yes";
  else
    cout << "No";
  return 0;
}
