#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

int main(){
	int a[100],n,s=0,m,x;
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>a[i];
		s+=a[i];
	}
	cout<<fixed<<setprecision(2)<<100+((s-100)*0.9)<<endl;
	
}
/**************************************************************
	Problem: 1160
	User: admin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/