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;
}

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)