N = int(input())
A = list(map(int, input().split()))

def f(x, y):
    return -x-y if x < 0 and y < 0 else abs(x-y)

A.sort()
ans1 = sum(f(A[i],A[i+1]) for i in range(N-1))
A[1:] = A[N-1:0:-1]
ans2 = sum(f(A[i],A[i+1]) for i in range(N-1))
print(min(ans1, ans2))