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