import sys

sys.setrecursionlimit(10**6)

deepest = 0
furt = 0

def main2():
  global deepest, furt
  n = int(input())
  connections=[[] for i in range(n+1)] # graph
  con = set() # fiuk

  for i in range(n-1):
    a,b=map(int,input().split())
    connections[a].append(b)
    con.add(b)

  parent = 0
  for f in range(1,n+1):
    if f not in con:
      parent = f
      break

  def deepsearch(node, depth):
    global deepest, furt
    if deepest < depth:
        deepest = depth
        furt = node
    for i in connections[node]:
        deepsearch(i, depth+1)

  deepsearch(parent, 0)
  print(furt)


main2()