from sys import stdin
input = stdin.readline

N = int(input())
AB = [list(map(int, input().split())) for _ in range(N)]

AB.sort(key=lambda x:x[0])
C = [AB[0][1]]
for i in range(1, N):
    C.append(max(C[-1], AB[i][1]))
now = 1
for _ in range(N):
    left = -1
    right = N
    while left+1 < right:
        mid = (left+right)//2
        if AB[mid][0] <= now:
            left = mid
        else:
            right = mid
    if left == -1: break
    now = C[left]

print(now)