#include<bits/stdc++.h> using namespace std; int main(){ int n,y[10000001]={}; double sum=0.0; cin>>n; for(int i=0;i<n;i++){ cin>>y[i]; if(y[i]<=70){ sum+=0.1; } else{ sum+=(y[i]/2)*0.1; } } cout<<sum; return 0; }