n = io.read("*n")
t = {}
for i = 1, n + 1 do
  t[i] = 1
end
t[1], t[n + 1] = 0, 0
m = io.read("*n")
sum = 1
for i = 1, m do
  sum = sum + io.read("*n")
  t[sum] = 0
end
m = io.read("*n")
sum = n + 1
for i = 1, m do
  sum = sum - io.read("*n")
  t[sum] = 0
end
ans = 0
for i = 1, n + 1 do
  ans = ans + t[i]
end
print(ans)