local n, m, k = io.read("*n", "*n", "*n", "*l")
local str = io.read()
local op = str:sub(1, 1)
local b = {}
for s in str:gmatch("(%d+)") do
  table.insert(b, tonumber(s))
end
table.sort(b)
local a = {}
for i = 1, n do
  a[i] = io.read("*n")
end
table.sort(a)
local cur_i = n
local cnt = 0
for j = 1, m do
  while true do
    if cur_i == 0 then break end
    local z = op == "*" and a[cur_i] * b[j] or a[cur_i] + b[j]
    if k <= z then
      cur_i = cur_i - 1
    else
      break
    end
  end
  cnt = cnt + n - cur_i
end
print(cnt)