import java.util.*;
import java.lang.*;
import java.io.*;

class Main
{
	public static void main (String[] args) 
	{
		// 入力値の読み込み
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int hyoukei=0;
		int count =0;
		int[] b = new int[a];
		
		for(int i=0;i<a;i++){
			b[i] = sc.nextInt();
			hyoukei += b[i];
		}
		
		for(int i=0;i<a;i++){
			if(b[i]*10 <= hyoukei)
			count += 1;
		}
		
		System.out.println(30*count);
	}
}