#include<iostream>
#include<fstream>
#include<sstream>
#include<string>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<ctime>
#include<stack>
#include<queue>
#include<set>
#include<map>
#include<vector>
#include<list>
#include<algorithm>
#include<utility>
#include<complex>
#include<functional>
using namespace std;

int data[100] = { 0 };
int zenbu = 0;
int res = 0;
int main(void){
	int N;
	cin >> N;
	for (int i = 0; i < N; i++){
		cin >> data[i];
		zenbu += data[i];
	}
	for (int i = 0; i < N; i++){
		if (data[i] * 10 <= zenbu)
			res++;
	}
	cout << res * 30 << endl;
	return(0);
}