#include <bits/stdc++.h>
using namespace std;
int main() {
  long a, b, c, a1, b1, c1;
  cin >> a >> b >> c;
  cin >> a1 >> b1 >> c1;
  a = a - a1;
  b = b - b1;
  c = c - c1;
  if (a > 0) a /= 2;
  if (b > 0) b /= 2;
  if (c > 0) c /= 2;
  if (a + b + c >= 0)
    cout << "Yes";
  else
    cout << "No";
  return 0;
}
