import random, time
N = int(input())

L = []
R = []

for _ in range(N):
    l, r = map(int, input().split())
    while 2 < l: 
        l /= 2
        r /= 2
    L.append(l)
    R.append(r)

def like(i, x):
    l, r = L[i], R[i]
    while x * 2 < 2 * l:
        x *= 2
    if l <= x < r: return True
    else: return False

ans = 0
begin = time.time()
while time.time() - begin < 1.5:
    x = random.random()
    cnt = 0
    for i in range(N):
        if like(i, x): cnt += 1
    ans = max(ans, cnt)

print(ans)