n = int(input())
y = tuple(map(int, input().split()))
m = {}
def f(a):
    if a not in m:
        cnt = 0
        for b in y:
            cnt += abs(b - a)
        m[a] = cnt
    return m[a]
l = min(y)
r = max(y)
while r - l > 2:
    if f(l) > f(r):
        l = (l * 2 + r) // 3
    else:
        r = (l + r * 2) // 3
print(min(f(l), f(l + 1), f(l + 2)))