import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int k = sc.nextInt();
		int[] x = new int[n + 2];
		int[] y = new int[n + 2];
		x[0] = sc.nextInt();
		y[0] = sc.nextInt();
		x[n + 1] = sc.nextInt();
		y[n + 1] = sc.nextInt();
		for (int i = 1; i <= n; i++) {
			x[i] = sc.nextInt();
			y[i] = sc.nextInt();
		}
		sc.close();

		int[] d = new int[n + 2];
		boolean[] fix = new boolean[n + 2];
		int ok = 200000;
		int ng = 0;
		while (Math.abs(ok - ng) > 1) {
			int mid = (ok + ng) / 2;

			Arrays.fill(d, 1000000007);
			d[0] = 0;
			Arrays.fill(fix, false);
			fix[0] = true;
			while (true) {
				int min = 1000000007;
				int cur = 0;
				for (int i = 0; i < d.length; i++) {
					if (!fix[i] && d[i] < min) {
						min = d[i];
						cur = i;
					}
				}
				if (cur == n + 1) {
					break;
				}
				fix[cur] = true;
				for (int next = 1; next <= n + 1; next++) {
					int v1 = Math.abs(x[cur] - x[next])
							+ Math.abs(y[cur] - y[next]);
					int alt = d[cur] + (v1 - 1) / mid;
					if (alt < d[next]) {
						d[next] = alt;
					}
				}
			}

			if (d[n + 1] <= k) {
				ok = mid;
			} else {
				ng = mid;
			}
		}
		System.out.println(ok);
	}
}