Help me in solving ZCO14003 problem

help
,
1

My issue

explain me this problem more clearly with giving its solution

My code

# cook your dish here

Problem Link: CodeChef: Practical coding for everyone

2

@ronit25
U have to maximize the revenue to can get my making a certain selling price for the mobile app.
and U can only buy if u have that much budget.
here is my c++ code for better understanding.

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

int main() {
    long long int n;
	cin>>n;
	long long int arr[1000000];
	for(int i=0;i<n;i++)
	{
	    cin>>arr[i];
	}
sort(arr,arr+n);
long long int count=0;
long long int ans=0;
for(int i=0;i<n;i++)
{
   count=arr[i]*(n-i);
   ans=max(ans,count);
    
}
cout<<ans;
	return 0;
}