local n = io.read("*n")
local a = (function ()
  local tb = {}
  for i = 1, n - 1 do
    tb[i] = io.read("*n")
  end
  return tb
end)()

local sum = 0
for i = 1, n - 1 do
  sum = sum + a[i]
end

local ans = (function ()
  local w = 0
  for score = 0, 100 do
    if (sum + score) % n == 0 then
      w = w + 1
    end
  end
  return w
end)()

print(ans)