N = int(input())
c = list(map(int, input().split()))
c.sort()
res = [[0]*2 for _ in range(4)]
for i in range(N):
    if i&1:
        res[0][1] += c[i]
        res[2][1] += c[N-i-1]
    else:
        res[0][0] += c[i]
        res[2][0] += c[N-i-1]
for i in range(N):
    if i==N-i-1:
        res[1][0] += c[i]
        res[3][0] += c[i]
        break
    else:
        res[1][0] += c[i]
        res[3][0] += c[N-i-1]
        res[1][1] += c[N-i-1]
        res[3][1] += c[i]
        if i+1==N-i-1:break
res = [abs(a)-abs(b) for a,b in res]
print(max(min(res[0:2]),min(res[2:4])))