#include<bits/stdc++.h> using namespace std; double gj(int zs){ double money = 0; if(zs % 70 != 0){ money = zs/70*0.1+0.1; }else{ money = zs/70*0.1; } return money; } int main(){ int n; cin >> n; int a[1501]; for(int i = 0;i < n;i++){ cin >> a[i]; } double sum = 0; for(int i = 0;i < n;i++){ sum = sum+gj(a[i]); } printf("%.1lf", sum); return 0; }