Task8

import java.util.Scanner;

public class Task8 {
    public static void main(String[] args) {
        int a, b, c ,d, z;
        Scanner in = new Scanner(System.in);
        a = in.nextInt();
        b = in.nextInt();
        c = in.nextInt();
        d = in.nextInt();
        z = Math.max(Math.min(a, b), Math.min(c, d));
        System.out.println(z);
    }
}