local n, d, w = io.read("*n", "*n", "*n")

local function uf_initialize(n)
  local parent = {}
  local rank = {}
  for i = 1, n do
    parent[i] = i
    rank[i] = 1
  end
  return parent, rank
end

local function uf_findroot(idx, parent)
  local idx_update = idx
  while parent[idx] ~= idx do
    idx = parent[idx]
  end
  while parent[idx_update] ~= idx do
    parent[idx_update], idx_update = idx, parent[idx_update]
  end
  return idx
end

local p1 = uf_initialize(n)
local p2, p2rank = uf_initialize(n)

for i = 1, d do
  local a, b = io.read("*n", "*n")
  local ra, rb = uf_findroot(a, p1), uf_findroot(b, p1)
  p1[rb], p1[b] = ra, ra
end
for i = 1, w do
  local a, b = io.read("*n", "*n")
  local ra, rb = uf_findroot(a, p2), uf_findroot(b, p2)
  if ra ~= rb then
    p2rank[ra] = p2rank[ra] + p2rank[rb]
    p2rank[rb] = false
    p2[rb], p2[b] = ra, ra
  end
end

local hub = {}
local ret = {}
for i = 1, n do
  hub[i] = {}
  ret[i] = 0
end

for i = 1, n do
  local a = uf_findroot(i, p1)
  local b = uf_findroot(i, p2)
  if not hub[a][b] then
    hub[a][b] = true
    ret[a] = ret[a] + p2rank[b]
  end
end

local ans = -n
for i = 1, n do
  local a = uf_findroot(i, p1)
  ans = ans + ret[a]
end
print(ans)