import java.util.*;

public class No609{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);

		int N = sc.nextInt();
		long[] Y = new long[N];
		long sum = 0;
		for(int i = 0; i < N; i++){
			Y[i] = sc.nextLong();
			sum += Y[i];
		}

		long mean;
		if(sum%N > 0){
			mean = sum/N + 1;
		}else{
			mean = sum/N;
		}

		long diff = 0;
		for(int i = 0; i < N; i++){
			diff += Math.abs(mean - Y[i]);
		}
		
		System.out.println(diff);
	}
}