import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();

        int[] xCoordinates = new int[n];
        int[] yCoordinates = new int[n];

        for (int i = 0; i < n; i++) {
            xCoordinates[i] = scanner.nextInt();
            yCoordinates[i] = scanner.nextInt();
        }

        double min = 100000000;

        for (int i = 0; i < n; i++) {
            double max1 = 0;
            double max2 = 0;

            for (int j = 0; j < n; j++) {
                int xDist = Math.abs(xCoordinates[i] - xCoordinates[j]);
                int yDist = Math.abs(yCoordinates[i] - yCoordinates[j]);
                double temp = Math.sqrt((double) (xDist * xDist) + (double) (yDist * yDist));

                if (temp >= max1) {
                    max2 = max1;
                    max1 = temp;
                } else if (temp > max2) {
                    max2 = temp;
                }
            }
            min = Math.min(min, max1 + max2);
        }

        System.out.println(min);
        scanner.close();
    }
}