#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c, x, y, z, sum = 0, p, q, w;
  scanf("%d %d %d", &a, &b, &c);
  scanf("%d %d %d", &x, &y, &z);
  if (a < x) sum = sum + x - a;
  if (b < y) sum = sum + y - b;
  if (c < z) sum = sum + z - c;
  if (a + b + c < x + y + z + sum)
    printf("No\n");
  else {
    if (a + b + c == x + y + z + sum) {
      p = 0;
      q = 0;
      w = 0;
      if (a - x >= 0) p = (a - x) % 2;
      if (b - y >= 0) q = (b - y) % 2;
      if (c - z >= 0) w = (c - z) % 2;
      if (p == 0 && q == 0 && w == 0)
        printf("Yes\n");
      else
        printf("No\n");
    } else
      printf("Yes\n");
  }
}
