#include<bits/stdc++.h> using namespace std; int cnt_dx(int x){ return (x+69)/70; } int main(){ int n,sum=0; cin>>n; for(int i=1;i<=n;i++){ int s; cin>>s; sum+=cnt_dx(s); } int y=sum/10; int j=sum%10; cout<<y<<'.'<<j; }