#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <algorithm>
#include <sstream>
#include <map>
#include <set>
using namespace std;


#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)

typedef long long ll;
typedef unsigned long long ull;
typedef long double lb;
/* ここからが本編 */
int main(void)
{
   int i,j,k;
   int n;
   static int c[1000000];
   ull sum = 0;
   double standard;
   int cnt = 0;
   cin >> n ;
   
   rep(i,n) {
      cin >> c[i];
      sum += c[i];
   }
   standard = (double)sum / 10;
   rep(i,n) {
      if(standard >= c[i]) cnt++;
   }
   cout << cnt*30 << endl;
   return 0;
}