noi1.5.1

1.5.1
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int a = scan.nextInt();
double c = 0.0;
for(int i = 0 ; i < a ; i++) {
int b = scan.nextInt();
c += b;
}
System.out.printf("%.2f", c / a);
}
}