C++ :

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

int main(){
	int a[1000],n,i,max = 0,s = 0;
	cin>>n;
	for(i = 0;i < n;i++){
		cin>>a[i];
		s = s + a[i];
		if(a[i] >= max){
			max = a[i];
		}
	}
	
	cout<<fixed<<setprecision(1)<<(max * 0.9 + s - max) * 0.9<<endl;
}

Java :

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
	       int n = sc.nextInt();
	       int[] a = new int[n];
	       for(int i=0;i<n;i++){
	           a[i] = sc.nextInt();
	       }
	       getMoney(a);

	}
	public static void getMoney(int[] a){
		int t;
		for(int i=1;i<=a.length-1;i++){
			for(int j=0;j<a.length-i;j++){
				if(a[j]<a[j+1]){
					t = a[j+1];
					a[j+1] = a[j];
					a[j] = t;
				}
			}
		}
		int sum = 0;double aver = 0;double f = 0 ;
		for(int i = 0;i<a.length;i++){
			if(i !=0){
				sum = sum + a[i];
			}
			f = a[0]*0.9;
		}
		aver = (sum + f)*0.9;
		System.out.println(String.format("%.1f", aver));
	}
}

Python :

n=int(input())
a=input().split()
a=list(map(int,a))
da=max(a)
s=(sum(a)-da+da*0.9)*0.9
print("%.1f"%s)