#include<bits/stdc++.h>
using namespace std;
int main()
{
int n;int a[100];double sum=0,h=0;
cin>>n;
for(int i=0;i<n;i++){
cin>>a[i];sum+=a[i];	
}
h = sum - 100;
h = h*0.9;
printf("%.2lf",100 + h);
	return 0;
}

/**************************************************************
	Problem: 1160
	User: zy002
	Language: C
	Result: Compile Error
****************************************************************/