妙解

#include<bits/stdc++.h>
using namespace std;
int a[100005];
int main(){
    int n; cin >> n;
    int maxn = -1;
    for(int i = 1;i <= n;i++){
        cin >> a[i];
        maxn = max(maxn,a[i]);
    }
    int maxx = -1;
    for(int i = 1;i <= maxn;i++){
        int can = 0;
        for(int j = 1;j <= n;j++){
            if(i <= a[j]) can++;
        }
        maxx = max(maxx,can * i);
    }
    cout << maxx;
    return 0;
}