n = int(input())
y = list(map(int, input().split()))
y.sort()
if y[0] == y[-1]:
    print(1)
    exit()
m = n // 2
y1 = y[:m]
y2 = y[m:]
y3 = y[:m + 1]
y4 = y[m + 1:]
ym1 = y1[len(y1) // 2]
ym2 = y2[len(y2) // 2]
ym3 = y3[len(y3) // 2]
ym4 = y4[len(y4) // 2]
ans1 = ans3 = 0
for yk in y1:
    ans1 += abs(ym1 - yk)
for yk in y2:
    ans1 += abs(ym2 - yk)
for yk in y3:
    ans3 += abs(ym3 - yk)
for yk in y4:
    ans3 += abs(ym4 - yk)
print(min(ans1,ans3))