import java.util.Scanner;

class no191{
	public static void main(String[] args) {
		Scanner stdIn=new Scanner(System.in);
		int i,s=0,a=0,c[]=new int[100],n;
		n=stdIn.nextInt();
		for(i=0;i<n;i++) {
			c[i]=stdIn.nextInt();
			s+=c[i];
		}
		for(i=0;i<n;i++) if(c[i]<=s/10) a++;
		System.out.print(30*a);
	}
}