#include <bits/stdc++.h>
using namespace std;
int a[10];
int main() {
  for (int i = 1; i <= 6; i++) scanf("%d", &a[i]);
  for (int i = 1; i <= 3; i++) {
    a[i] -= a[i + 3];
    if (a[i] > 0) a[i] /= 2;
  }
  int sum = a[1] + a[2] + a[3];
  if (sum >= 0)
    puts("Yes");
  else
    puts("No");
  return 0;
}
