#どっちも正なら差、それ以外は絶対値の和
n = int(input())
a = list(map(int,input().split()))
#どちらも正を多くしたい
a.sort(key=abs)
t = [a.pop(), a.pop()]
a.sort()
a = [t[0]] + a + [t[1]]

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

    
ans = 0
for i in range(n-1):
    ans += f(a[i], a[i+1])
print(ans)