#include <bits/stdc++.h>
using namespace std;
int a, b, c, x, y, z;
int main() {
  std::ios_base::sync_with_stdio(false);
  cin >> a >> b >> c;
  cin >> x >> y >> z;
  int dif1 = a - x;
  int dif2 = b - y;
  int dif3 = c - z;
  if (dif1 >= 0 && dif2 >= 0 && dif3 >= 0)
    cout << "Yes\n";
  else {
    if (dif1 > 0 && dif1 % 2 == 1) dif1--;
    if (dif2 > 0 && dif2 % 2 == 1) dif2--;
    if (dif3 > 0 && dif3 % 2 == 1) dif3--;
    if (dif1 < 0) dif1 *= 2;
    if (dif2 < 0) dif2 *= 2;
    if (dif3 < 0) dif3 *= 2;
    int sum = dif1 + dif2 + dif3;
    if (sum >= 0)
      cout << "Yes\n";
    else
      cout << "No\n";
  }
  return 0;
}
