n = int(input())
E = []
N = 1<<50
t = 0
for _ in range(n):
    l, r = list(map(int, input().split()))
    while r < N:
        l *= 2
        r *= 2
    if N <= l:
        E.append(l*3+1)
    else:
        t += 1
    E.append(r*3-1)
    for _ in range(2):
        l, r = 2*l, 2*r
        E.append(2*l*3+1)
        E.append(2*r*3-1)

E.sort()
ans = 0
for s in E:
    s %= 3
    if s == 2:
        s = -1
    t += s
    ans = max(ans, t)

print(ans)