#include <iostream>
#include <vector>
using namespace std;
int main(int argc, char* argv[])
{
	int N;
	cin>>N;
	int i;
	vector<int> C(N);
	int Sum=0;
	for (i=0;i<N;i++){
		cin>>C[i];
		Sum+=C[i];
	}
	Sum/=10;
	int ans=0;
	for (i=0;i<N;i++){
		if (C[i]<=Sum){
			ans++;
		}
	}
	cout<<ans*30<<endl;

	return 0;
}