from collections import Counter

def main():
    N = int(input())
    Y = tuple(map(int, input().split()))

    c = Counter(Y).most_common()
    y = sorted(Y)
    idx = N // 2
    dist = float('inf')
    for i in (c[0][0], y[idx]):
        n = 0
        for j in y:
            n += abs(i - j)
        dist = min(dist, n)

    print(dist)

main()