#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,t=0,sum=0;
	cin>>n;
	int m[105];
	for(int i=0;i<n;i++)
	{
		cin>>m[i];
		sum+=m[i];
	} 
	t=sum-100;
	printf("%.2f",t*0.9+100.00);
	return 0;
}


/**************************************************************
	Problem: 1160
	User: lzc
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/