#!/usr/bin/python3

import sys
import re
import traceback

max  = None
line = sys.stdin.readline()
while line:
  m = re.match(r'^([0-9]+)\.[0-9]+ ([df]) (.*)$', line)
  if m is not None and m.group(3) != '.':
    ts = int(m.group(1))
    if max is None or ts > max[0]:
      max = [ts, m.group(3)]
  line = sys.stdin.readline()

if max is not None:
  print("{}".format(max[0]))