#include<bits/stdc++.h>
# define N 500000
using namespace std;
int n,a,b,t;
priority_queue<int>q; 
int main()
{
	freopen("dry.in","r",stdin);
	freopen("dry.out","w",stdout);
	int i,c,x;
	cin>>n>>a>>b;
	for(i=1;i<=n;i++)
	{
		cin>>c;
		q.push(c);
	}
	while(q.top()>t*a)
	{
		++t;
		x=q.top();
		q.pop();
		q.push(x-b);
	}
			cout<<t<<endl;
			return 0;
//	cout<<t<<endl;
	return 0;
}