Problem Description

GigaCode Inc. conducts recruitment interviews every year.
This company places great importance on two aspects in recruitment: "Technical Skills" and "Social Skills". In the recruitment process, they score each applicant on a scale of 0 to 100 for both "Technical Skills" and "Social Skills", and only those who meet both of the following conditions are considered for acceptance:

• The applicant must score at least $X$ points in Technical Skills and at least $Y$ points in Social Skills.
• The total score of Technical Skills and Social Skills must be at least $Z$ points.

This year, $N$ university students applied. The $i$-th applicant scored $A_i$ points in Technical Skills and $B_i$ points in Social Skills. Determine how many applicants will pass the recruitment interview.

Input Format

The input is given from the standard input in the following format:

$ N $ $ X $ $ Y $ $ Z $ $ A_1 $ $ B_1 $ $ A_2 $ $ B_2 $ $ A_3 $ $ B_3 $ ... $ A_N $ $ B_N $

Output Format

Output an integer representing how many applicants will pass the recruitment interview.

Sample Input and Output

Sample Input #1

1 60 20 100
72 28

Sample Output #1

1

Sample Input #2

5 70 70 150
72 77
70 90
65 88
75 75
97 84

Sample Output #2

3

Sample Input #3

15 80 60 150
20 24
33 17
29 36
40 18
15 27
10 41
53 77
42 15
12 17
32 10
19 28
37 27
91 2
13 25
40 40

Sample Output #3

0

Notes/Hints

Constraints

• $1 \leq N \leq 100$
• $0 \leq A_i \leq 100$
• $0 \leq B_i \leq 100$
• $0 \leq X \leq 100$
• $0 \leq Y \leq 100$
• $0 \leq Z \leq 200$
• All inputs are integers

Partial Points

This problem is divided into several sub-tasks, and you will be considered to have solved a sub-task if you correctly solve all test cases in that sub-task.
The score of your submitted source code will be the sum of the points of the sub-tasks you solved.

1. (30 points) $ N = 1 $
2. (30 points) All $ N $ applicants pass the recruitment interview.
3. (40 points) No additional constraints.

Hint for Sub-task 1

In Sub-task 1, all test cases have $ N = 1 $. That is, the input is given in the following format:

$ N $ $ X $ $ Y $ $ Z $ $ A_1 $ $ B_1 $

At that time, if all conditions $X \leq A_1, Y \leq B_1, Z \leq A_1 + B_1$ are satisfied, the first applicant passes, so output $ 1 $. Otherwise, output $ 0 $.
Note that this sub-task can be solved without using iterative processing.

Hint for Sub-task 2

In Sub-task 2, the answer is always $ N $.

Hint for Sub-task 3

Using iterative processing such as a for loop and conditional branching such as an if statement can help solve this sub-task.

Sample Explanation 1

The first applicant meets the following conditions and thus passes:
- The score in Technical Skills is $ 72 $ points, which is above the passing criterion of $ 60 $ points.
- The score in Social Skills is $ 28 $ points, which is above the passing criterion of $ 20 $ points.
- The total score of Technical Skills and Social Skills is $ 72 + 28 = 100 $ points, which is above the passing criterion of $ 100 $ points.
Therefore, the number of passing applicants is $ 1 $.
This input-output example satisfies the constraints of the first sub-task (Sub-task $ 1 $) and also the second sub-task (Sub-task $ 2 $).

Sample Explanation 2

Only the second, fourth, and fifth applicants pass.
This input-output example does not satisfy the constraints of Sub-task $ 1 $ since $N \neq 1$.

Sample Explanation 3

This recruitment test is very challenging.

见题面 Input 部分

见题面 Output 部分