local n = io.read("*n")
local t = {}
for i = 1, n do t[i] = 0 end
for i = 1, n - 1 do
  local a, b = io.read("*n", "*n")
  t[a] = t[a] + 1
  t[b] = t[b] + 1
end
local cnt = 0
for i = 1, n do
  if(t[i] == 1) then cnt = cnt + 1 end
end
print(cnt - 2)