N = int(input())

if N > 22:
    print(0)
    exit()

rates = list(map(int, input().split()))
rate_sums = [[] for k in range(11)]
for comb in range(1, 1 << N):
    if comb.bit_count() > 11:
        continue
    
    rate_sum = 0
    for i in range(N):
        if (comb >> i) & 1: rate_sum += rates[i]
    rate_sums[comb.bit_count() - 1].append(rate_sum)

ans = 2 ** 30
for k in range(11):
    if ans == 0 or k > 5:
    	break
    rate_sums[k].sort()
    for i in range(len(rate_sums[k]) - 1):
        if ans > abs(rate_sums[k][i] - rate_sums[k][i + 1]):
            ans = abs(rate_sums[k][i] - rate_sums[k][i + 1])
            if ans == 0:
                break