#include <iostream>
#include <algorithm>
#include <math.h>
using namespace std;

int main(){
    int n, s, ans;
    cin >> n;
    int a[n];
  	s = 0, ans = 0;
  	for ( int i = 0; i < n; i++ ){
      cin >> a[i];
      s += a[i];
    }
  	int border = s/10;
    for ( int i = 0; i < n; i++ ){
      if ( a[i] <= border ) ans++;
    }
  	
  
  	cout << ans*30 << endl;
    return 0;
}