Get Min Operations

In each round, choose one unfinished task as the primary task and execute it for x seconds, while every other unfinished task executes for y seconds, where y<x. A task leaves as soon as it has executed enough; find the minimum number of rounds to empty the task pool.

输入格式

The first line contains n x y, followed by n execution amounts. Complete original bounds: 1≤n≤300000, 1≤execution amount≤10^9, 1≤y<x≤10^9; problem 17 keeps its original bound of 300,000 and does not reuse the 100,000 of problem 7.

输出格式

Output a single integer, the answer.

样例 1

输入：

5 4 2
3 4 1 7 6

输出：

3

样例 2

输入：

5 3 2
3 3 6 3 9

输出：

3

样例 3

输入：

3 3 1
2 3 5

输出：

3

样例说明

The outputs of the three public examples are, in order: 3; 3; 3. These answers were verified by independent enumeration or direct simulation.