C++ :

#include <bits/stdc++.h>
using namespace std;

int n,a,b;
int num[500010];
int l = 1,r,mid;

//x秒能否烘干衣服 
bool check(int x){
	int sum = 0;
	for(int i = 1;i <= n;i++){
		//能晒干 
		if(a * x >= num[i]) continue;
		if((num[i] - a * x) % b == 0){
			sum += (num[i] - a * x) / b;
		} else{
			sum += (num[i] - a * x) / b + 1;
		}
		
		if(sum > x) return false;
	} 
	return true;
}

int main(){
	scanf("%d%d%d",&n,&a,&b);
	for(int i = 1;i <= n;i++){
		scanf("%d",&num[i]);
		r = max(r,num[i]);
	}
	
	while(l <= r){
		mid = l + r >> 1;
		if(check(mid)) r = mid - 1;
		else l = mid + 1;
	}
	
	cout<<l;
	return 0;
}