1546 평균

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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;


public class Main {
	
 public static void main(String[] args) throws IOException {
	 BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	 int N = Integer.parseInt(br.readLine());
	 StringTokenizer st = new StringTokenizer(br.readLine(), " ");
	 int score[] = new int[N];
	 for(int i = 0; i < N; i++) {
		 score[i] = Integer.parseInt(st.nextToken());
	 }
	 int max = 0;
	 
	 for(int i = 0; i < N; i++) {
		 max = Math.max(max, score[i]);
	 }
	 
	 double sum = 0;
	 for(int i = 0; i < N; i++) {
		 sum += (double)score[i]/max*100; 
	 }
	 System.out.println(sum/N);
 }
}