#include <bits/stdc++.h>
using namespace std;
int N, i, j, T, a, b, c, d, e, f;
int main() {
  scanf("%d", &a);
  scanf("%d", &b);
  scanf("%d", &c);
  scanf("%d", &d);
  scanf("%d", &e);
  scanf("%d", &f);
  if (a < d)
    i += d - a;
  else
    j += (a - d) / 2;
  if (b < e)
    i += e - b;
  else
    j += (b - e) / 2;
  if (c < f)
    i += f - c;
  else
    j += (c - f) / 2;
  printf("%s\n", i > j ? "No" : "Yes");
  return 0;
}
