N=int(input())
C=list(map(int,input().split()))
A=[]
for i in range(9):
  for j in range(C[i]):
    A.append(i+1)
ANS=0
M=(N+1)>>1
L=N>>1
for t in range(1,60):
  mod=1<<t
  P=[pow(10,i,mod) for i in range(N+1)]
  DP=[set() for i in range(1<<N)]
  DP[0]=set([0])
  for i in range(1<<N):
    c=bin(i).count('1')
    if c>=L:
      x=((1<<N)-1)^i
      for j in DP[i]:
        if (-j*P[N-c])%mod in DP[x]:
          ANS=t
          break
      if ANS==t:
        break
    if c>=M:
      continue
    for j in range(N):
      if (i>>j)&1:
        continue
      for k in DP[i]:
        DP[i|(1<<j)].add((k*10+A[j])%mod)
  if ANS<t:
    break
print(ANS)