n, k = map(int, input().split())
A = list(map(int, input().split()))

med = n // 2
Am = A[med]
A1 = [abs(a - Am) for a in A]
A1.sort(reverse=True)
A2 = [abs(a - A[0]) for a in A]
A2 = A2[::-1]
A3 = [abs(a - A[-1]) for a in A]

ans1, ans2, ans3 = 0, 0, 0

for i in range(n):
    if i < n - k:
        ans1 -= A1[i]
        ans2 -= A2[i]
        ans3 -= A3[i]
    else:
        ans1 += A1[i]
        ans2 += A2[i]
        ans3 += A3[i]
print(min(ans1, ans2, ans3))