#include<bits/stdc++.h> #define int long long using namespace std; int n,a; double t; int f(int a){ int s=0; if(a>70){ if(a%70==0)s=a/70; else s=a/70+1; } else{ s=1; } return s; } signed main(){ cin>>n; for(int i = 1;i<=n;i++){ cin>>a; t+=f(a)*0.1; } printf("%.1lf",t); return 0; }