import java.util.Scanner;
public class Kyotaku{
	public static void main(String arg[]){
		int n,sum=0,res=0;
		Scanner sc = new Scanner(System.in);
		n = sc.nextInt();
		int[] c = new int[n];
		for(int i = 0;i<n;i++){
			c[i] = sc.nextInt();
			sum = sum + c[i];
		}
		for(int i = 0;i<n;i++){
			if(sum == 0){
				res = n*30;
				break;
			}
			if((double)c[i]  / (double)sum <= 0.1)res = res + 30;
		}
		System.out.println(res);
	}
}