#include <bits/stdc++.h>
using namespace std;
const long double pi = 3.14159265358979323846;
const int maxn = 1e7 + 9;
const long long mod = 1e9 + 7;
const long long INF = 1e18 + 9;
const int minn = 1e5 + 9;
const long long N = 2e2;
int main() {
  long long a, b, c, x, y, z;
  cin >> a >> b >> c >> x >> y >> z;
  if (max(0ll, a - x) / 2 + max(0ll, b - y) / 2 + max(0ll, c - z) / 2 >=
      max(0ll, x - a) + max(0ll, y - b) + max(0ll, z - c)) {
    cout << "Yes";
  } else {
    cout << "No";
  }
}
