import bisect
N = int(input())
R = list(map(int, input().split())) 
FR,SR = R[:N//2],R[N//2:]
FRSB = [set() for _ in range(22)]
SRSB = [set() for _ in range(22)]

for fr in FR:
    for i in reversed(range(21)):
        for frsl in list(FRSB[i]):
            FRSB[i+1].add(frsl+fr)
            FRSB[i+1].add(frsl-fr)
    FRSB[0].add(fr)
    FRSB[0].add(-fr)

for sr in SR:
    for i in reversed(range(21)):
        for srsl in list(SRSB[i]):
            SRSB[i+1].add(srsl+sr)
            SRSB[i+1].add(srsl-sr)
    SRSB[0].add(sr)
    SRSB[0].add(-sr)

ans = 10**18
for k in range(21):
    FRS = sorted(FRSB[k])
    SRS = sorted(SRSB[k])
    for frs in FRS:
        i = bisect.bisect_left(SRS,frs)
        if 0<i:
            ans = min(ans,frs-SRS[i-1])
        if i<len(SRS)-1:
            ans = min(ans,SRS[i]-frs)
    if k%2==0:
        for i,j in zip(FRS,FRS[1:]):
            ans = min(ans,j-i) 
        for i,j in zip(SRS,SRS[1:]):
            ans = min(ans,j-i) 
print(ans)