#include<bits/stdc++.h>
using namespace std;
int m,i,a[105],h;
float p;
int main(){
	cin>>m;
	for(i=0;i<m;i++){
		cin>>a[i];
	}
	for(i=0;i<m;i++){
		h+=a[i];
	}
	p=h*1.0/m;
	if(h<=100){
		printf("%.2f",h);
	}else{
		p=100+((h-100)*0.9);
		printf("%.2f",p);
	}
	return 0;
}

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