program main
  integer,parameter::limit=100000
  integer::N,i,sum,prev,mindist=limit+1
  integer,allocatable::X(:)
  integer::Y(0:limit)=0
  read *,N
  allocate(X(N))
  read *,X

  do i=1,N
     Y(X(i))=Y(X(i))+1
  end do

  do i=0,limit
     if(Y(i).ne.0) then
        sum = Y(i)
        prev =i
        exit
     end if
  end do

  if(sum .eq. N) then
     print '(i0)', 0
  end if

  do i=prev+1, limit
     if(Y(i).ne.0) then
        mindist = MIN(mindist, i-prev)
        prev = i
        sum = sum + Y(i)
        if(sum.eq.N) exit
        continue
     end if
  end do

  if(mindist.eq.(limit+1)) mindist=0
  print '(i0)', mindist
end program main