#include <bits/stdc++.h>
using namespace std;
int a[3], b[3];
int main() {
  for (int i = 0; i < 3; i++) cin >> a[i];
  for (int i = 0; i < 3; i++) cin >> b[i];
  for (int i = 0; i < 3; i++) {
    bool ok = true;
    while (a[i] > b[i] + 1 && ok) {
      ok = false;
      for (int j = 0; j < 3; j++)
        if (a[j] < b[j] && a[i] > b[i] + 1) a[j]++, a[i] -= 2, ok = true;
    }
  }
  string ans = "Yes";
  for (int i = 0; i < 3; i++)
    if (a[i] < b[i]) ans = "No";
  cout << ans;
  return 0;
}
