#include <bits/stdc++.h>
using namespace std;
int main()
{
	int a,n,i;
	float s;
	cin>>n;
	for(i=1;i<=n;i++)
	{
		cin>>a;
		s+=a;
		
	}
	s=(s-100)*0.9+100;
	printf("%.2f",s);
	
	
	
	
	return 0;
}

/**************************************************************
	Problem: 1160
	User: 21A
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/