#include <iostream>
using namespace std;

int main(){
   int ans = 0,n,vote = 0;
   cin >> n;
   int c[n];
   for(int i = 0;i < n;i++){
      cin >> c[i];
      vote += c[i];
   }
   for(int i = 0;i < n;i++) if(vote / 10 > c[i]) ans++;
   if(!vote) cout << n * 30 << endl;
   else cout << ans * 30 << endl;
}