#!/usr/bin/env python3
from sys import exit

n = int(input())

if n == 1:
    print(4)
    exit()

points = [(int(p[0]), int(p[1])) for p in [input().split() for _ in range(n)]]

m1 = max(x + y for x, y in points) - min(x + y for x, y in points)
m2 = max(x - y for x, y in points) - min(x - y for x, y in points)

if min(m1, m2) == 0:
    print(m1 + m2 + 5)
else:
    print(m1 + m2 + 4)