ZCO-2013::SMARTPHONE
#include <bits/stdc++.h>
using namespace std;
int main() {
int n;
cin>>n;
long long int a[n], max=INT16_MIN, temp;
for(int i=0;i<n;++i){
cin>>a[i];
}
sort(a, a+n);
for(int i=0;i<n;++i){
temp = a[i]*(n-i);
if(temp>max)
max=temp;
}
cout<<max;
return 0;
}
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