import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

import numpy as np

N = int(readline())
data = np.array(read().split(),np.int64)
AB = data[:N+N]
A = AB[::2]
B = AB[1::2]
XY = data[N+N+1:]
X = XY[::2]
Y = XY[1::2]

count = np.array([np.count_nonzero((A >= x) & (B <= y)) for x,y in zip(X,Y)])

x = count.max()
answer = np.where(count == x)[0] + 1

if x == 0:
    print(0)
else:
    print('\n'.join(answer.astype(str)))