[백준] 1546 평균 (Java)

/*
 * Author : Jeonghun Cho
 * Date : December 3, 2019
 * https://www.acmicpc.net/problem/1546
 */
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
public class Main {
    public static void main(String[] args) throws IOException{
        // TODO Auto-generated method stub
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        int[] size = new int[Integer.parseInt(br.readLine())]; 
        String[] str = br.readLine().split(" "); 
        double dSize = 0.0, maxSize = 0.0, sum = 0.0;
        for(int i=0; i<size.length; i++) { 
            size[i] = Integer.parseInt(str[i]); 
            if(maxSize < size[i]) { 
                maxSize = size[i];
            }
        }
        for(int i=0; i<size.length; i++) { 
            sum += size[i]/maxSize*100;
        }
        bw.write(sum/size.length+"\n");
        bw.flush();
        bw.close();
        br.close();
    }
}