local n = io.read("*n")
local t = {}
local removed = {}
for i = 1, n do
  t[i] = {}
  removed[i] = false
end
for i = 1, n - 1 do
  local a, b = io.read("*n", "*n")
  table.insert(t[a], b)
  table.insert(t[b], a)
end

local tasks = {}
local tasknum, done = 0, 0
for i = 1, n do
  if #t[i] == 1 then
    tasknum = tasknum + 1
    table.insert(tasks, i)
  end
end
local cnt = 0
while done < tasknum do
  done = done + 1
  local curidx = tasks[done]
  for i = 1, #t[curidx] do
    local dstidx = t[curidx][i]
    if not removed[dstidx] then
      removed[dstidx] = true
      for j = 1, #t[dstidx] do
        local dstdstidx = t[dstidx][j]
        local tmp = 0
        for k = 1, #t[dstdstidx] do
          local dddidx = t[dstdstidx][k]
          if not removed[dddidx] then tmp = tmp + 1 end
        end
        if tmp == 0 then cnt = cnt + 1
        elseif tmp == 1 then
          tasknum = tasknum + 1
          table.insert(tasks, dstdstidx)
        end
      end
      break
    end
  end
end
print(cnt)