function! s:output()
  let this = {'lines': []}

  function! this.append(line) abort
    call add(self.lines, a:line)
  endfunction

  function! this.build() abort
    return join(self.lines, "\n")
  endfunction

  return this
endfunction

function! s:main(input) abort
  let o = s:output()

  let c_list = map(split(a:input[1], ' '), 'str2nr(v:val)')
  let c_sum = 0
  for c in c_list
    let c_sum += c
  endfor

  let border = c_sum / 10
  let r = 0
  for c in c_list
    if c <= border
      let r += 1
    endif
  endfor
  let r = r * 30

  call o.append(r)
  return o.build()
endfunction

let s:input = getline(1, '$')
enew
put =s:main(s:input)
2,$print