#include<bits/stdc++.h> using namespace std; int main(){ int n,a[10000]; cin>>n; double sum=0; for(int i=1;i<=n;i++){ cin>>a[i]; if(a[i]<=70) sum+=0.1; else if(a[i]%70==0) sum+=a[i]/70*0.1; else sum+=a[i]/70*0.1+0.1; } cout<<fixed<<setprecision(1)<<sum; }