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

def calc(x):
    count = []
    for a in A:
        count.append(abs(x-a))
    count.sort()
    ans = 0
    for i in range(n):
        if i < k:
            ans += count[i]
        else:
            ans -= count[i]
    return ans


l = A[0]-1
r = A[-1]+1
while r > l+1:
    m1 = (r+2*l)//3
    m2 = (2*r+l)//3
    c1 = calc(m1)
    c2 = calc(m2)
    if c1 <= c2:
        r = m2
    else:
        l = m2
ans = 10**20
print(min(calc(A[0]),calc(A[-1])))