scan = string.gmatch(io.read(),"%d+")
n = scan()
scan()
w = string.byte("W")
result = 0
for i = 1, n do
  local s = io.read()
  local t = {s:byte(1,s.len(s))}
  for j , v in ipairs(t) do
    if v == w then
      result = result + 1
    end
  end
end
print(result)