def popcount(n):
  c=(n&0x5555555555555555)+((n>>1)&0x5555555555555555)
  c=(c&0x3333333333333333)+((c>>2)&0x3333333333333333)
  c=(c&0x0f0f0f0f0f0f0f0f)+((c>>4)&0x0f0f0f0f0f0f0f0f)
  c=(c&0x00ff00ff00ff00ff)+((c>>8)&0x00ff00ff00ff00ff)
  c=(c&0x0000ffff0000ffff)+((c>>16)&0x0000ffff0000ffff)
  c=(c&0x00000000ffffffff)+((c>>32)&0x00000000ffffffff)
  return c

N = int(input())
R = list(map(int,input().split()))

if N >= 26:
  print(0)
  exit()

dp = [[] for n in range(N + 1)]
stack = [(0,0,-1)]
while len(stack):
  r,c,i = stack.pop()
  dp[c].append(r)
  if (c + 1) * 2 > N:
    continue
  for j in range(i + 1,N):
    stack.append((r + R[j],c + 1,j))

ans = 800000
for n in range(1,N + 1):
  if 2 * n > N:
    break
  le = len(dp[n])
  dp[n].sort()
  for i in range(le - 1):
    ans = min(ans,dp[n][i + 1] - dp[n][i])
print(ans)