#include <bits/stdc++.h>
using namespace std;
const int INF = 0x3fffffff;
const int inf = -INF;
const int N = 1000000;
const int M = 105;
const int mod = 1000000007;
const double pi = acos(-1.0);
int a, b, c;
int x, y, z;
int main() {
  scanf("%d %d %d", &a, &b, &c);
  scanf("%d %d %d", &x, &y, &z);
  a -= x;
  b -= y;
  c -= z;
  if (a > 0) a /= 2;
  if (b > 0) b /= 2;
  if (c > 0) c /= 2;
  if (a + b + c < 0)
    puts("No");
  else
    puts("Yes");
}
