#include <stdio.h>
#define rep(E, F) for (E = 0; E < (F); E++)
#define per(E, F) for (E = (F) - 1; E >= 0; E--)
#define INF (1 << 30)
int min(int a, int b) { if (a > b) return b; return a; }
int max(int a, int b) { if (a < b) return b; return a; }
int get_int()
{
	int r = 0, c = getchar(), s = 1;
	while (c != '-' && c < '0' || c > '9') c = getchar();
	while (c == '-') s *= -1, c = getchar();
	while (c >= '0' && c <= '9') r = r*10 + c - '0', c = getchar();
	return s*r;
}

int main()
{
	int i, n = get_int(), r[4] = {INF, -INF, INF, -INF};
	int x[n], y[n];
	rep(i, n) x[i] = get_int(), y[i] = get_int();
	rep(i, n) r[0] = min(r[0], y[i] - x[i]), r[1] = max(r[1], y[i] - x[i]), r[2] = min(r[2], x[i] + y[i]), r[3] = max(r[3], x[i] + y[i]);
	printf("%d\n", r[1] - r[0] + r[3] - r[2] + 4);
	return 0;
}