#include <bits/stdc++.h>
using namespace std;
int main() {
  long long a, b, c, x, y, z;
  cin >> a >> b >> c >> x >> y >> z;
  long long xt[3];
  xt[0] = a - x;
  xt[1] = b - y;
  xt[2] = c - z;
  sort(xt, xt + 3);
  if (xt[2] < 0) {
    cout << "No" << endl;
    return 0;
  } else {
    if (xt[1] < 0) {
      if (xt[2] / 2 >= -(xt[1] + xt[0])) {
        cout << "Yes" << endl;
        return 0;
      } else {
        cout << "No" << endl;
        return 0;
      }
    } else {
      if (xt[0] >= 0) {
        cout << "Yes" << endl;
        return 0;
      } else {
        if (xt[2] / 2 + xt[1] / 2 >= -xt[0]) {
          cout << "Yes" << endl;
          return 0;
        } else {
          cout << "No" << endl;
          return 0;
        }
      }
    }
  }
}
