import java.util.*;
public class Kyotaku{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		int[] num = new int[n];
		int sum = 0;
		for(int i = 0; i < n;i++){
			num[i] = scan.nextInt();
			sum+=num[i];
		}
		double admit = sum/n;
		int result=0;
		for(int j = 0; j<n;j++){
			if((double)num[j]<admit)result++;
		}

		System.out.println(result*30);
	}
}