Smartphone

#include <iostream>
using namespace std;
#include <algorithm>

int main()
{

    long long int n, i;
    cin >> n;
    long long int li[n], sale;

    for (i = 0; i < n; ++i)
        cin >> li[i];

    sort(li, li + n);
    sale = li[n - 1];

    for (i = n - 2; i >= 0; --i)
    {
        if (li[i] * (n - i) > sale)
           sale = li[i] * (n - i);
    }

    cout << sale;

    return 0;
}