import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) {
	      BufferedReader stdReader =new BufferedReader(new InputStreamReader(System.in));
	      try {
	    	int n = Integer.parseInt(stdReader.readLine());
	    	int sum = 0;
	    	int count = 0;
	    	String[] temps = stdReader.readLine().split(" ");
	    	int[] num = new int[n];
	    	for(int i=0;i<n;i++){
	    		num[i]= Integer.parseInt(temps[i]);
	    		sum += num[i];
	    	}
	    	sum /= 10;
	    	for(int i=0;i<n;i++){
	    		if(num[i]<=sum) count++;
	    	}
	    	
	    	System.out.println(count*30);
	      } catch (IOException e) {
			e.printStackTrace();
	      }
	}

}