/* ***********************************************

Author        :Zhou Zhentao

Email         :774388357@qq.com

Created Time  :2015/12/15 12:45:27

File Name     :main.cpp

************************************************ */

#include <stdio.h>

#include <string.h>

#include <iostream>

#include <algorithm>

#include <vector>

#include <queue>

#include <set>

#include <map>

#include <string>

#include <math.h>

#include <stdlib.h>

#include <time.h>

using namespace std;

int a,b,c;

int x,y,z;

int flagA,flagB,flagC;

int flag2;

int main()

{

    while(~scanf("%d%d%d",&a,&b,&c))

    {

        scanf("%d%d%d",&x,&y,&z);

        flagA=,flagB=,flagC=,flag2=;

        int num=;

        if(a>=x) flagA=flagA+a-x;

        else flag2=flag2+x-a;

        if(b>=y) flagB=flagB+b-y;

        else flag2=flag2+y-b;

        if(c>=z) flagC=flagC+c-z;

        else flag2=flag2+z-c;

        num=num+flagA/;

        num=num+flagB/;

        num=num+flagC/;

        if(num>=flag2) printf("Yes\n");

        else printf("No\n");

    }

    return ;

}