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

local function getcnt(tbl)
  local c = 0
  for k, v in pairs(tbl) do c = c + 1 end
  return c
end

local tasks = {}
local tasknum, done = 0, 0
for i = 1, n do
  if getcnt(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 dstidx, v in pairs(t[curidx]) do
    for ddidx, v2 in pairs(t[dstidx]) do
      t[dstidx][ddidx], t[ddidx][dstidx] = nil, nil
      local c = getcnt(t[ddidx])
      if c == 0 then cnt = cnt + 1
      elseif c == 1 then
        table.insert(tasks, ddidx)
        tasknum = tasknum + 1
      end
    end
    break
  end
end
print(cnt)