#include "bits/stdc++.h"

using namespace std;

const char en = '\n';
using  ll =          long long;
using ull = unsigned long long;

int main() {
	int n,sum=0,result=0;
	cin>>n;

	vector<int> in(n);

	for(auto& i:in){
		cin>>i;
		sum+=i;
	}
	sum/=10;
	for(auto i:in){
		if(i<=sum) result++;
	}

	cout<<result*30<<en;

	return 0;
}