#include <bits/stdc++.h>
using namespace std;
int a[5], b[5];
int main() {
  for (int i = 0; i < 3; i++) scanf("%d", a + i);
  for (int i = 0; i < 3; i++) scanf("%d", b + i);
  int sum = 0;
  for (int i = 0; i < 3; i++) sum += (a[i] - b[i]) / (1 + (a[i] > b[i]));
  puts(sum < 0 ? "No" : "Yes");
  return 0;
}
