from collections import Counter
from bisect import bisect

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

    y = sorted(Y)
    if N == 1:
        print(y[0])
        return
    elif N == 2:
        print(abs(y[1] - y[0]))
        return
    else:
        c = Counter(Y)
        dist = float('inf')
        mid = (y[0] + y[1]) / 2
        x = bisect(y, mid)
        for i in (y[x], y[x-1]):
            n = 0
            for j, k in c.items():
                n += abs(i - j) * k
            dist = min(dist, n)

    print(dist)

main()