from bisect import bisect_left
from collections import defaultdict

N = int(input())
    
if N > 22:
    print(0)
    exit()

def clc_sums(rates):
    M = len(rates)
    rate_sums = defaultdict(lambda: [])
    
    for comb in range(3 ** M):
        balance, rate_sum = 0, 0
        for i in range(M):
            sgn = (comb // (3 ** i)) % 3
            if sgn == 2: sgn = -1
            balance += sgn
            rate_sum += sgn * rates[i]
        rate_sums[balance].append(rate_sum)
    
    for balance in range(-M, M + 1):
        rate_sums[balance].sort()
    
    return rate_sums

rates = list(map(int, input().split()))

front_sums = clc_sums(rates[:N // 2])
back_sums = clc_sums(rates[N // 2:])

ans = 2 ** 30
for balance in range(-N // 2, N // 2 + 1):
    for front_sum in front_sums[balance]:
        i = bisect_left(back_sums[-balance], -front_sum)
        if i > 0: ans = min(ans, abs(front_sum - back_sums[-balance][i - 1]))
        if i < len(back_sums[-balance]) - 1: ans = min(ans, abs(front_sum - back_sums[-balance][i + 1]))
print(ans)