#include <bits/stdc++.h>
using namespace std;
#pragma comment(linker, "/STACK:65536000")
template <class T1>
void deb(T1 e1) {
  cout << e1 << endl;
}
template <class T1, class T2>
void deb(T1 e1, T2 e2) {
  cout << e1 << " " << e2 << endl;
}
template <class T1, class T2, class T3>
void deb(T1 e1, T2 e2, T3 e3) {
  cout << e1 << " " << e2 << " " << e3 << endl;
}
template <class T1, class T2, class T3, class T4>
void deb(T1 e1, T2 e2, T3 e3, T4 e4) {
  cout << e1 << " " << e2 << " " << e3 << " " << e4 << endl;
}
template <class T1, class T2, class T3, class T4, class T5>
void deb(T1 e1, T2 e2, T3 e3, T4 e4, T5 e5) {
  cout << e1 << " " << e2 << " " << e3 << " " << e4 << " " << e5 << endl;
}
template <class T1, class T2, class T3, class T4, class T5, class T6>
void deb(T1 e1, T2 e2, T3 e3, T4 e4, T5 e5, T6 e6) {
  cout << e1 << " " << e2 << " " << e3 << " " << e4 << " " << e5 << " " << e6
       << endl;
}
int main() {
  int a, b, c, x, y, z, cont_m = 0, cont_n = 0;
  scanf("%d %d", &a, &b);
  scanf("%d", &c);
  scanf("%d %d", &x, &y);
  scanf("%d", &z);
  if (a > x)
    cont_m += (a - x) / 2;
  else if (a < x)
    cont_n += (x - a);
  if (b > y)
    cont_m += (b - y) / 2;
  else if (y > b)
    cont_n += (y - b);
  if (c > z)
    cont_m += (c - z) / 2;
  else if (c < z)
    cont_n += (z - c);
  if (cont_m >= cont_n)
    printf("Yes\n");
  else
    printf("No\n");
  return 0;
}
