https://www.acmicpc.net/problem/11399

ATM.java

import java.util.*;

public class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int []person = new int[N];
		for(int i=0; i<N; i++)
			person[i] = sc.nextInt();
		sc.close();
		Arrays.sort(person);
		int result = 0;
		for(int i=0; i<N; i++)
			for(int j=0; j<=i; j++)
				result+=person[j];
		System.out.print(result);
	}
}