#include <bits/stdc++.h>
using namespace std;
int main(){
float n,a[250],q=0;
cin>>n;
for(int i=1;i<=n;i++){
	cin>>a[i];
}
for(int i=1;i<=n;i++){
q=q+a[i];

}
if(q>=100){
	q=(q-100)*0.9+100;
}
printf("%.2f",q);
    return 0;
}
/**************************************************************
	Problem: 1160
	User: wangyousi
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/