#include <bits/stdc++.h>
using namespace std;
double PI = 3.1415926536;
int dX[] = {1, -1, 0, 0};
int dY[] = {0, 0, 1, -1};
int main() {
  int a, b, c, x, y, z, extra = 0, need = 0;
  cin >> a >> b >> c >> x >> y >> z;
  if (a > x)
    extra += ((a - x) / 2) * 2;
  else
    need += x - a;
  if (b > y)
    extra += ((b - y) / 2) * 2;
  else
    need += y - b;
  if (c > z)
    extra += ((c - z) / 2) * 2;
  else
    need += z - c;
  if (extra / 2 >= need)
    cout << "Yes\n";
  else
    cout << "No\n";
}
