#include <bits/stdc++.h>
using namespace std;

int main()
{
	int N;
	cin >> N;
	vector<long long> C( N );
	for( int i = 0; i < N; i++ ) {
		cin >> C[i];
	}

	long long sum = 0;
	for( int i = 0; i < N; i++ ) {
		sum += C[i];
	}
	long long ans = 0;
	for( int i = 0; i < N; i++ ) {
		if( C[i] * 10 <= sum ) ans++;
	}
	ans *= 30;

	cout << ans << endl;
}