#include <bits/stdc++.h>
using namespace std;
const long long INF = 1e18 + 1;
inline long long input(void) {
  char t;
  long long x = 0;
  int neg = 0;
  t = getchar();
  while ((t < 48 || t > 57) && t != '-') t = getchar();
  if (t == '-') {
    neg = 1;
    t = getchar();
  }
  while (t >= 48 && t <= 57) {
    x = (x << 3) + (x << 1) + t - 48;
    t = getchar();
  }
  if (neg) x = -x;
  return x;
}
inline void output(long long x) {
  char a[20];
  int i = 0, j;
  a[0] = '0';
  if (x < 0) {
    putchar('-');
    x = -x;
  }
  if (x == 0) putchar('0');
  while (x) {
    a[i++] = x % 10 + 48;
    x /= 10;
  }
  for (j = i - 1; j >= 0; j--) {
    putchar(a[j]);
  }
  putchar('\n');
}
int main() {
  long long a, b, c, x, y, z;
  a = input();
  b = input();
  c = input();
  x = input();
  y = input();
  z = input();
  if (a >= x) {
    a -= x;
    x = 0;
  } else {
    x -= a;
    a = 0;
  }
  if (b >= y) {
    b -= y;
    y = 0;
  } else {
    y -= b;
    b = 0;
  }
  if (c >= z) {
    c -= z;
    z = 0;
  } else {
    z -= c;
    c = 0;
  }
  if (a > 0) {
    if (a >= 2 * y) {
      a -= 2 * y;
      y = 0;
    } else {
      y -= a / 2;
      a = 0;
    }
  }
  if (a > 0) {
    if (a >= 2 * z) {
      a -= 2 * z;
      z = 0;
    } else {
      z -= a / 2;
      a = 0;
    }
  }
  if (b > 0) {
    if (b >= 2 * x) {
      b -= 2 * x;
      x = 0;
    } else {
      x -= b / 2;
      b = 0;
    }
  }
  if (b > 0) {
    if (b >= 2 * z) {
      b -= 2 * z;
      z = 0;
    } else {
      z -= b / 2;
      b = 0;
    }
  }
  if (c > 0) {
    if (c >= 2 * y) {
      c -= 2 * y;
      y = 0;
    } else {
      y -= c / 2;
      c = 0;
    }
  }
  if (c > 0) {
    if (c >= 2 * x) {
      c -= 2 * x;
      x = 0;
    } else {
      x -= c / 2;
      c = 0;
    }
  }
  if (x == 0 && y == 0 && z == 0)
    printf("Yes\n");
  else
    printf("No\n");
  return 0;
}
