Contest Duration: - (local time) (100 minutes) Back to Home
A - Colorful Transceivers /

Time Limit: 2 sec / Memory Limit: 1024 MB

• 1 a,b,c 100
• 1 d 100
• 入力は全て整数

### 入力

a b c d


### 入力例 1

4 7 9 3


### 出力例 1

Yes


AさんとBさんは直接会話可能です。また、BさんとCさんも直接会話可能です。従って Yes を出力してください。

### 入力例 2

100 10 1 2


### 出力例 2

No


この場合は不可能です。

### 入力例 3

10 10 10 1


### 出力例 3

Yes


### 入力例 4

1 100 2 10


### 出力例 4

Yes


Score : 100 points

### Problem Statement

Three people, A, B and C, are trying to communicate using transceivers. They are standing along a number line, and the coordinates of A, B and C are a, b and c (in meters), respectively. Two people can directly communicate when the distance between them is at most d meters. Determine if A and C can communicate, either directly or indirectly. Here, A and C can indirectly communicate when A and B can directly communicate and also B and C can directly communicate.

### Constraints

• 1 a,b,c 100
• 1 d 100
• All values in input are integers.

### Input

Input is given from Standard Input in the following format:

a b c d


### Output

If A and C can communicate, print Yes; if they cannot, print No.

### Sample Input 1

4 7 9 3


### Sample Output 1

Yes


A and B can directly communicate, and also B and C can directly communicate, so we should print Yes.

### Sample Input 2

100 10 1 2


### Sample Output 2

No


They cannot communicate in this case.

### Sample Input 3

10 10 10 1


### Sample Output 3

Yes


There can be multiple people at the same position.

### Sample Input 4

1 100 2 10


### Sample Output 4

Yes