#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//INSERT ABOVE HERE
signed main(){
  Int n;
  cin>>n;
  vector<Int> c(n);
  for(Int i=0;i<n;i++) cin>>c[i];
  Int s=accumulate(c.begin(),c.end(),0);
  Int ans=0;
  for(Int i=0;i<n;i++) ans+=c[i]*10<=s;
  cout<<ans*30<<endl;
  return 0;
}