n=gets.to_i
pq_base=[nil]
gets.split.each.with_index(1){|j,i|
  a=j.to_i<<8
  i/=2 while i>1 && a<pq_base[i]=pq_base[i/2]
  pq_base[i]=a
}
pq_base<<1e9

el=gets.split.map{|i|(i.to_i/2<<8)+1}
min=1e9
n.times{
  max=0
  pq=pq_base.dup
  el.rotate!.each{|e|
    a=pq[n]
    d=pq[i=1]+e
    while (c=i*2)<n
      c+=1 if pq[c]>pq[c+1]
      break if a<=pq[i]=pq[c]
      i=c
    end
    pq[i]=a
    i=n
    i>>=1 while i>1 && d<pq[i]=pq[i>>1]
    x=(pq[i]=d)&0xFF
    max=x if max<x
  }
  min=max if min>max
}
p min