import java.util.*;
import java.lang.*;
import java.io.*;

class A406 {
    public static void main(String[] args) {
        int[][] matrix;
        double maxDistance = 0;
        double distance;
        Scanner scanner = new Scanner(System.in);
        int m = scanner.nextInt();
        matrix = new int[2][m];

        for (int i = 0; i < 2; i++)
            for (int j = 0; j < m; j++)
                matrix[i][j] = scanner.nextInt();

        for (int i = 0; i < m; i++) {
            for (int j = i + 1; j < m; j++) {
                distance = Math.sqrt((matrix[0][j] - matrix[0][i]) * (matrix[0][j] - matrix[0][i]) + (matrix[1][j] - matrix[1][i]) * (matrix[1][j] - matrix[1][i]));
                if (distance > maxDistance) {
                    maxDistance = distance;
                }
            }
        }

        System.out.println(maxDistance);
    }
}