#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 a[1501]; int main(){ int n; cin>>n; 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; }