t = 1
#t = int(input())

for _ in range(t):
  n = int(input())
  lis = [list(map(int, input().split())) for _ in range(n)]
  ma = 1
  lis.sort()
  for i in range(n):
    a,b = lis[i]
    if a > ma:
      continue
    ma = max(ma,b)
  print(ma)