Problem Statement

Given integers A and B, find A+B.
This is a N-choice problem; the i-th choice is C_i.
Print the index of the correct choice.

Input

The input is given from Standard Input in the following format:
N A B
$C_1 C_2 \dots C_N$

Output

Print the answer as an integer.

Constraints

• All values in the input are integers.
• $1 \le N \le 300$
• $1 \le A,B \le 1000$
• $1 \le C_i \le 2000$
• C_i are pairwise distinct. In other words, no two choices have the same value.
• There is exactly one i such that A+B=C_i. In other words, there is always a unique correct choice.

Sample Input 1

3 125 175
200 300 400

Sample Output 1

2

We have 125+175 = 300.
The first, second, and third choices are 200, 300, and 400, respectively.
Thus, the 2-nd choice is correct, so 2 should be printed.

Sample Input 2

1 1 1
2

Sample Output 2

1

The problem may be a one-choice problem.

Sample Input 3

5 123 456
135 246 357 468 579

Sample Output 3

5

见题面 Input 部分

见题面 Output 部分