// yukicoder: No.609 Noelちゃんと星々
// 2019.5.5 bal4u

#include <stdio.h>

#if 1
#define gc() getchar_unlocked()
#else
#define gc() getchar()
#endif
int in()   // 整数の入力（負数対応）
{
	int n = 0, c = gc();
	if (c == '-') {	c = gc();
		do n = 10*n + (c & 0xf), c = gc(); while (c >= '0');
		return -n;
	}
	do n = 10*n + (c & 0xf), c = gc(); while (c >= '0');
	return n;
}

#define ABS(x)  ((x)>=0?(x):-(x))
int y[100005];

int main()
{
	int i, N, t;
	long long s, min;

	N = in();
	s = 0; for (i = 0; i < N; i++) {
		y[i] = in();
		s += y[i];
	}
	t = (int)(s / N);
	min = 0; for (i = 0; i < N; i++) min += ABS(y[i]-t);
	if (s % N) {
		t++;
		s = 0; for (i = 0; i < N; i++) s += ABS(y[i]-t);
		if (s < min) min = s;
	}
	printf("%lld\n", min);
	return 0;
}