백준 4단계 no.5

import java.util.*;

public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        int n = sc.nextInt();
        double[] arr = new double[n];
        
        for (int i = 0; i < arr.length; i++) {
            arr[i] = sc.nextInt();
        }
        
        double max = arr[0];
        
        for (int j = 0; j < arr.length; j++) {
            if (arr[j] >= max) {
                max = arr[j];
            }
        }
        
        for (int k = 0; k < arr.length; k++) {
            arr[k] = arr[k]/max*100;
        }
        
        double sum = 0;
        
        for (int l = 0; l < arr.length; l++) {
            sum += arr[l];
        }
        
        System.out.print(sum/arr.length);
    }
}