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