# https://github.com/robe2222555/atcoder-lib/blob/main/template/python/main.py
import sys
input = lambda: sys.stdin.readline().rstrip()
def LI(): return list(map(int, input().split()))
def II(): return int(input())
INF = 1<<60

def solve():
	N = II()
	Item = [LI() for _ in range(N)]
	Item.sort()
	R = 1
	for a,b in Item:
		if a<=R:
			R = max(R, b)
	print(R)
	return


def main():
	T = 1
	for _ in range(T):
		solve()
	return


if __name__ == '__main__':
	main()