package b20160710;

import java.util.Scanner;

public class No_191 {
public static void main(String[] args) {
	double sum = 0;
	Scanner sc = new Scanner(System.in);
	int N = sc.nextInt();
	int[] MiT = new int[N];
	for(int i = 0; i < N; i++){
		MiT[i] = sc.nextInt();
		sum+= MiT[i];
	}
	sc.close();
	double MP = sum * 0.1;
	int CMiT = 0;
	for(int i = 0; i <  N; i++){
		if(MiT[i] <= MP){
			CMiT += 30;
		}
	}
	System.out.println(CMiT);
}
}