#include <bits/stdc++.h>
using namespace std;
const int INF = 0x7fffffff;
int main() {
  int a, b, c;
  int x, y, z;
  while (scanf("%d %d %d", &a, &b, &c) != EOF) {
    scanf("%d %d %d", &x, &y, &z);
    int aa = a - x, bb = b - y, cc = c - z;
    if (aa < 0)
      aa = aa * 2;
    else
      aa = aa / 2 * 2;
    if (bb < 0)
      bb = bb * 2;
    else
      bb = bb / 2 * 2;
    if (cc < 0)
      cc = cc * 2;
    else
      cc = cc * 2 / 2;
    if (aa + bb + cc < 0)
      printf("No\n");
    else
      printf("Yes\n");
  }
  return 0;
}
