#include <bits/stdc++.h>
int main() {
  int n, i, x, y, z, a, b, c;
  scanf("%d%d%d", &x, &y, &z);
  scanf("%d%d%d", &a, &b, &c);
  int sum = 0, lack = 0;
  if (x > a)
    sum += ((x - a) / 2) * 2;
  else
    lack += (a - x);
  if (y > b)
    sum += ((y - b) / 2) * 2;
  else
    lack += (b - y);
  if (z > c)
    sum += ((z - c) / 2) * 2;
  else
    lack += (c - z);
  if (sum >= 2 * lack)
    printf("Yes");
  else
    printf("No");
  return 0;
}
